Conditional access system

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a limited reception method or system for controlling reception of a terminal device for a signal relayed from a signal such as satellite broadcasting via a transmission line such as CATV.

【0002】

[Conventional technology]

In satellite broadcasting and the like, a pass-through method is generally known as a method of transmitting a scrambled signal as it is without descramble or re-scramble at a CATV station or the like to perform limited reception.

【0003】

In addition, a method called simulcrypt is known as a method of mixing two or more limited receptions for one content.

【0004】

Hereinafter, the conventional technique will be described with reference to the drawings.

【0005】

FIG. 40 is a diagram showing a main part of the pass-through system configuration.

【0006】

The satellite center 4001 and the CATV station 4009 are connected by a satellite line using the satellite 4008, and the CATV station 4009 and the terminal device 4015 are connected by a CATV network.

【0007】

The satellite center 4001 that transmits content through satellites transmits content server 4002 that transmits content including video and audio, and information for scrambling the content and information for decoding it (ECM, EMM). Conditional access control unit 4004, multiplexing unit 4003 that generates a stream that multiplexes content with ECM or EMM, scrambler 4005 that scrambles the specified content of the stream, modulation of the stream according to the satellite line, etc. It includes a transmission unit 4006 that performs transmission processing and a transmission antenna 4007 that sends a modulated stream to a satellite line.

【0008】

In addition, the CATV station 4009, which sends the content received from the satellite to the CATV network, has a receiving antenna 4010 that receives the stream from the satellite line, a receiving unit 4011 that performs reception processing such as demodulation on the received stream, and program arrangement information ( The PSI converter 4012 that converts PSI) from satellite transmission to cable transmission, the QAM modulator 4013 that modulates the demodulated data into the QAM format specified by CATV, and the QAM modulator 4013 that converts the stream to the CATV transmission frequency. It is equipped with a frequency conversion unit 4014 that sends out to the CATV network.

【0009】

At the satellite center 4001 of this system, the content server 4002 transmits content including video and audio to the multiplexing unit 4003. In addition, the limited reception control unit 4004 encrypts the common information (ECM) having the determination area for determining the viewing permission for the content and the scrambled key (Ks) scrambled for the content with the work key (Kw) and multiplex unit. The individual information (EMM) that has the contract information area that sends to 4003 and gives each terminal device 4015 permission to view the content and the Kw that encrypts the ECM is the individual key unique to each terminal device 4015. It is encrypted with (Kmi) and transmitted to the multiplexing unit 4003, and further, an identifier (PID) for identifying the content to be scrambled and a scramble key (Ks) are transmitted to the scrambler 4005.

【0010】

The multiplexing device 4003 multiplexes the received content and the ECM and EMM into one stream and transmits the scrambler 4005, and the scrambler 4005 has a PID specified by the limited reception control unit 4004 among the received streams. Scramble the content and send it to the transmitter 4006. The transmission unit 4006 performs transmission processing such as modulation according to the satellite line, and transmits the stream to the satellite line via the transmission antenna 4007.

【0011】

In the CATV station 4009, the receiving unit 4011 receives the stream from the satellite line via the receiving antenna 4010, performs reception processing such as demodulation, and transmits it to the PSI conversion unit 4012. The PSI conversion unit 4012 converts NIT, which is a part of program sequence information (PSI) and transmits information related to transmission line information such as modulation frequency and content, from satellite transmission use to cable transmission use. Is transmitted to the QAM modulator 4013, the QAM modulator 4013 modulates the QAM method specified by CATV and transmits it to the frequency converter 4014, and the frequency converter 4014 converts the stream to the CATV transmission frequency and CATV. Send to the network.

【0012】

When the terminal device 4015 receives a stream from the CATV network, decodes the EMM addressed to it, retains the contract information and Kw, and views the scrambled content, it first receives the ECM accompanying the content. Then, decrypt with Kw, compare the judgment area in the ECM with the contract information, and check whether viewing permission is available. If it is determined that the viewing permission is granted, the content can be descrambled using Ks in the ECM and can be viewed.

【0013】

As described above, in the pass-through method, the CATV station 4009 simply converts the stream to a modulation method suitable for the CATV network, does not need to decode the ECM or EMM, and does not participate in the contents. It can be relayed. In this method, the satellite center 4001 manages all contracts for each terminal device 4015.

【0014】

Further, FIG. 41 is a diagram showing a main part of a system configuration of a simulcrypt system in which a plurality of limited receptions are mixed for the same content. In FIG. 41, the relationship between the content, ECM, EMM, etc. is the same as described above.

【0015】

The broadcasting center 4101 has a first EMM generation device 4103 that generates EMM for a terminal device belonging to the first limited reception method and a second EMM generation device 4103 that generates EMM for a terminal device belonging to the second limited reception method. It is composed of 4104, a first ECM generator 4105 that generates an ECM of a first limited reception method, a second ECM generator 4106 that generates an ECM of a second limited reception method, and video and audio. A content server 4102 that sends out the contents, a multiplexing unit 4109 that multiplexes the contents and the first and second EMMs and ECMs, a Ks generator 4108 that generates Ks for scrambling the contents at regular intervals, and a first device. A simulcrypt control unit 4107 that outputs the first and second ECMs to the multiplexing unit 4109 and outputs PID and Ks to the scrambler 4110, a scrambler 4110 that executes scrambling, and a terminal device 4112 that modulates the stream. It is equipped with a transmission unit 4111 to send to.

【0016】

In the broadcasting center 4101 of this system, the content server 4102 transmits the content composed of video and audio to the multiplexing unit 4109. The first EMM generator 4103 transmits the first EMM including the contract information area that grants viewing permission to the content to each terminal device 4112 belonging to the first limited reception method to the multiplexing unit 4109. The second EMM generator 4104 transmits a second EMM including a contract information area that grants viewing permission to the same content as above to each terminal device 4112 belonging to the second limited reception method to the multiplexing unit 4109. .. Further, the Ks generator 4108 generates Ks for scrambling the content at regular intervals and transmits the Ks to the simulcrypt control unit 4107. The simulcrypt control unit 4107 transmits the received Ks to the first ECM generator 4105 and the second ECM generator 4106, and the first ECM generator 4105 is a determination area for determining viewing permission for the content. The first ECM including the above and the received Ks is generated and transmitted to the simulcrypt control unit 4107, and the second ECM generator 4106 receives the determination area for determining the viewing permission for the same content as above. A second ECM containing the Ks is generated and transmitted to the Simulcrypt Control Unit 4107.

【0017】

The simulcrypt control unit 4107 transmits the received first ECM and second ECM to the multiplexing unit 4109, and also transmits the PID and Ks that identify the content to be scrambled to the scrambler 4110. The multiplexing unit 4109 multiplexes the content, the first ECM, the second ECM, the first EMM, and the second EMM and transmits them as one stream to the scrambler 4110, and the scrambler 4110 has the specified PID. And Ks, scramble the corresponding content and send it to the transmission unit 4111. The transmission unit 4111 performs modulation processing or the like suitable for the transmission line on this stream and sends it to the transmission line.

【0018】

The terminal device 4112 belonging to the first limited reception method receives the first EMM addressed to itself from the stream, holds the contract information, and compares the judgment area of the first ECM attached to the content with the contract information. If it is determined that the viewing permission is granted, the content can be descrambled and can be viewed. Further, the terminal device 4112 belonging to the second limited reception method receives the second EMM addressed to itself from the stream, holds the contract information, and determines the second ECM determination area and the contract information attached to the content. By comparison, if it is determined that the viewing permission is granted, the content can be descrambled and can be viewed.

【0019】

In this way, if the simulcrypt method is used, it is possible to mix a plurality of limited receptions for the same content.

【0020】

Further, by combining the pass-through method and the simulcrypt method described above, simple and flexible limited reception becomes possible. That is, if the satellite center 4001 in FIG. 40 and the broadcasting center 4101 in FIG. 41 are regarded as the same, it is possible to mix a plurality of limited receptions in the satellite center 4001, and the CATV station 4009 is involved in the respective ECMs and EMMs. Broadcast without. In this way, for example, when there is a direct receiving terminal that directly receives the content from the satellite center 4001 through the satellite line, the direct receiving terminal uses the first limited reception method and connects to the CATV station 4009. By using the second limited reception method for the terminal device 4015, the satellite center 4001 and the CATV station 4009 can independently realize the limited reception of their respective terminals.

【0021】

[Problems to be Solved by the Invention]

However, in the method combining the conventional techniques as described above, the second EMM generator installed in the satellite center generates and sends the EMM for the terminal device to be managed by the CATV station. In this case, since it is necessary for the CATV station to notify the satellite center of the contract information of the terminal device managed by the CATV station or the EMM itself, there is a concern that the confidentiality of the contract information may be reduced.

【0022】

In addition, depending on the form of the system, it is assumed that there are multiple CATV stations that manage tens of thousands of terminal devices, and in this case, the transmission capacity of the second EMM sent from the satellite center can be significantly increased. There is sex. In the current digital broadcasting, the transmission capacity of one broadcasting frequency band is about 30 Mbps, and increasing the transmission capacity of the second EMM means reducing the transmission capacity of the content, so that the image quality of the content deteriorates. And there is a risk of reducing the number of channels. Also, in this case, if the bandwidth of the transmission capacity of the second EMM is limited, the content will not be affected, but the time required to send the entire second EMM due to the bandwidth limitation of the second EMM. There is a possibility that the contract information of each terminal device will not be reflected immediately, and the content that the customer wants to watch cannot be viewed immediately.

【0023】

The present invention solves these problems, and in a relay device that relays the content from the center device, the content is relayed without descrambled and without decoding the ECM or EMM, and the content is affected. It is an object of the present invention to provide a limited reception system capable of performing a limited reception unique to a relay device, and to provide a device constituting the system.

【0024】

[Means for solving problems]

In the first invention, the center device, one or more relay devices, and one or more first terminal devices are connected by a first transmission line, and the relay device and one or more second terminal devices are second. The center device scrambles the content including video and audio and sends it to the first transmission line, and the scramble key for scrambling the content and the access determination to the content. The first individual including the first work key and the contract information of the first terminal device that encrypts the first common information including the access determination area and multiplexes the content and encrypts the first common information. The information is encrypted and multiplexed with the content, and the second common information including the scramble key and the access determination area is encrypted with the second work key and multiplexed with the content, and the relay device receives from the first transmission line. The information including the content is relayed to the second transmission line, and the second individual information including the contract information of the second work key and the second terminal device is encrypted and multiplexed with the information including the content. Sending to the second transmission line, the first terminal device is based on the access determination area included in the first common information and the contract information included in the first individual information, and the second terminal device is , It has a means of controlling access to the content based on the access determination area included in the second common information and the contract information included in the second individual information.

【0025】

As described above, in the first invention, the center device sends out the scrambled key obtained by scrambling the content together with the content and the first individual information in the first common information and the second common information, and the relay device receives the content. The content, the first individual information, the first common information, and the second common information are relayed without decoding, and the second individual information is multiplexed and transmitted, so that the content is connected to the relay device. The content from the center device can be provided to the second terminal device in a simple configuration, the cost can be reduced, and the limited reception unique to the relay device can be performed.

【0026】

In the second invention, the center device, one or more relay devices, and one or more first terminal devices are connected by a first transmission line, and the relay device and one or more second terminal devices are connected. A limited reception system connected by a second transmission line, and the center device and the relay device are further connected by a third transmission line, and the center device contains contents including either video, audio, or data. The first common information including the scramble key for scrambling and sending to the first transmission line to scramble the content and the first access determination area for determining access to the content is encrypted and multiplexed with the content, and the first The first work key for encrypting the common information of the above and the first individual information including the contract information of the first terminal device are encrypted and multiplexed with the contents and sent to the first transmission line, and the scramble key and the scramble key and The second common information including the second access determination area for determining access to the content is encrypted with the second work key and sent to the third transmission line, and the relay device receives from the first transmission line. The information including the content is relayed to the second transmission line, the second common information received from the third transmission line is multiplexed with the information including the content, and the second work key and the second terminal device are used. The second individual information including the contract information of the above is encrypted and multiplexed with the information including the contents and sent to the second transmission line, and the first terminal device is the first access included in the first common information. Based on the determination area and the contract information included in the first individual information, the second terminal device is included in the second access determination area and the second individual information included in the second common information. It has a means of controlling access to the content based on the contract information.

【0027】

As described above, in the second invention, the center device sends the second common information to the third transmission line, and the relay device multiplexes the second common information and the second individual information to the information including the content. Since there is no unnecessary second common information in the first terminal device on the first transmission line, it leads to prevention of malfunction of the first terminal device. Further, since the relay device can transmit the content and the second ECM to the second transmission line without particularly scrambling or decoding, the content can be provided to the second terminal device with a simple configuration. , The effect of reducing the cost can be obtained.

【0028】

In the third invention, the center device sends out the second common information once each time it is changed, and the relay device receives the second common information and then receives the changed second common information. It has a means of repeatedly transmitting the second common information at regular intervals until it is completed.

【0029】

As described above, in the third invention, since the relay device repeatedly transmits the second common information, it is possible to increase the transmission capacity of the content and the like on the first transmission line, and the content can be changed. The effect of increasing the image quality and increasing the number of channels can be obtained.

【0030】

In the fourth invention, the center device has a means of encrypting the second common information by an encryption method different from the first common information encryption method.

【0031】

As described above, in the fourth invention, since the first common information and the second common information are encrypted by different methods, the limited reception for the first terminal device and the second terminal device is further independent. Even if one of the encryption methods is broken, the effect that the other limited reception is not affected can be obtained.

【0032】

In the fifth invention, the relay device has a means of encrypting the second individual information by an encryption method different from the first individual information encryption method performed by the center device.

【0033】

As described above, in the fifth invention, since the first individual information and the second individual information are encrypted by different methods, the limited reception for the first terminal device and the second terminal device is further independent. Even if one of the encryption methods is broken, the effect that the other limited reception is not affected can be obtained.

【0034】

The sixth invention has means that the access determination area of the first common information is described by a tier and the access determination area of the second common information is described by a channel bitmap.

【0035】

As described above, in the sixth invention, since the configuration of the access determination area of the first common information and the second common information is separated, the limited reception to the first terminal device and the second terminal device is further performed. It can be performed independently, and even if the configuration of one access determination area is detected and falsified, the effect that the other limited reception is not affected can be obtained.

【0036】

The seventh invention has means that the access determination area of the first common information is described by a channel bitmap, and the access determination area of the second common information is described by a tier.

【0037】

As described above, in the seventh invention, since the configuration of the access determination area of the first common information and the second common information is separated, the limited reception to the first terminal device and the second terminal device is further performed. It can be performed independently, and even if the compulsion of one access determination area is detected and falsified, the effect that the other limited reception is not affected can be obtained.

【0038】

In the eighth invention, the center device stores the scramble key in the second common information and sends it out, and the relay device receives the second common information and additionally sends out the access determination area. Have.

【0039】

As described above, in the eighth invention, the center device stores the scramble key in the second common information and sends it out, and the relay device adds an access determination area to the second common information and relays the second. It is possible to obtain the effect that the limited reception for the terminal device of the above can be performed more independently.

【0040】

In the ninth invention, the center device stores the scramble key in the second common information, encrypts it with the second work key, and sends it out, and the relay device receives the second common information and sets the access determination area. The area including the added and received second common information and the added access judgment area is encrypted with the third work key and sent out, and the second individual information includes the second work key and the third work key. Has a means of storing and sending. As described above, in the ninth invention, the center device stores and sends the scramble key in the second common information, the relay device adds the access determination area to the second common information, and further, the third work key. So, the entire second common information including the access judgment area was encrypted and sent, and the second individual information was sent including the second work key and the third work key. It is possible to perform limited reception to the terminal device of the above independently, and it is possible to obtain the effect of ensuring the confidentiality of the second common information.

【0041】

According to the tenth invention, the relay device has a means for removing and relaying the first common information existing in the information including the content received from the first transmission line.

【0042】

As described above, in the tenth invention, since the relay device removes the first common information and relays the information, the effect of increasing the transmission capacity of the information transmitted to the second transmission line can be obtained.

【0043】

According to the eleventh invention, the relay device relays by exchanging the first common information existing in the information including the content received from the first transmission line and the second common information received from the third transmission line. It has the means.

【0044】

As described above, in the eleventh invention, since the relay device replaces the second common information with the first common information and transmits the second common information, the transmission capacity of the information including the contents on the first transmission line is increased. The effect of being able to relay to the second transmission line can be obtained. In the twelfth invention, the center device appropriately multiplexes empty information in the content and sends it to the first transmission line, and the relay device transmits the information including the content received from the first transmission line to the first individual information. It has a means of exchanging and multiplexing the empty information existing in the information including the content and the second individual information by removing and relaying the information.

【0045】

As described above, in the twelfth invention, the relay device removes the first individual information and relays the information, replaces the second information with the empty information, and transmits the information. Therefore, the information is transmitted to the second transmission line. The effect of increasing the information transmission capacity can be obtained.

【0046】

According to the thirteenth invention, the relay device has a means of exchanging and multiplexing the first individual information existing in the information including the content received from the first transmission line and the second individual information.

【0047】

As described above, in the thirteenth invention, when the relay device transmits the second individual information, the information including the content on the first transmission line is transmitted in place of the first individual information. The effect of being able to relay to the second transmission line without increasing the transmission capacity can be obtained.

【0048】

In the fourteenth invention, the relay device has means for frequency-multiplexing and transmitting the second individual information in a frequency band different from the frequency band for relaying the information including the contents.

【0049】

As described above, in the fourteenth invention, the relay device transmits the second individual information in a frequency band different from the frequency band for relaying the information including the content, so that the transmission capacity of the information including the content is transmitted. The effect that the second individual information can be transmitted with an arbitrary transmission capacity can be obtained without affecting the above.

【0050】

In the fifteenth invention, the relay device and the second terminal device are also connected by a fourth transmission line different from the second transmission line, and the relay device transmits information including contents to the second transmission line. The second individual information is sent to the fourth transmission line, and the second terminal device receives the second common information received from the second transmission line and the second common information received from the fourth transmission line. It has a means of controlling access to the content based on the individual information of. As described above, in the fifteenth invention, the relay device and the second terminal device are connected by the second transmission line and the fourth transmission line, and the relay device relays the information including the contents to the second transmission line. Since the second individual information is transmitted on the fourth transmission line, the effect is that the second individual information can be transmitted with an arbitrary transmission capacity without affecting the transmission capacity of the information including the content. can get.

【0051】

In the sixteenth invention, a program attribute indicating whether the content is a tier program or a pay-per-view program is provided in the second common information, and the center device stores the tier information and the pay-per-view information in the access determination area of the second common information. The sending and relay device arbitrarily changes the program attribute of the second common information to a value indicating either the tier program, the pay-per-view program, or both according to the operation, and the second terminal device refers to the program attribute. Then, the access control is determined by either the tier, the pay-per-view, or both.

【0052】

As described above, in the 16th invention, the second common information is provided with a program attribute indicating whether the corresponding content is a tier program or a pay-per-view program, and the center device provides the tier information and the tier information in the access determination area of the second common information. Since the pay-per-view information is stored and transmitted, and the relay device arbitrarily changes the program attributes according to the operation to relay, the effect that limited reception to the second terminal device can be performed more independently. Is obtained.

【0053】

In the seventeenth invention, there is a means for sending the second work key from the center device to the relay device by a storage medium.

【0054】

As described above, in the seventeenth invention, since the second work key is sent from the center device to the relay device by the storage medium, the effect that the second work key can be easily and surely shared can be obtained.

【0055】

In the eighteenth invention, there is a means for transmitting the second work key from the center device to the relay device on the first transmission line.

【0056】

As described above, in the eighteenth invention, since the second work key is transmitted from the center device to the relay device on the first transmission line, the second work key can be changed at any timing and immediately. The effect of being able to share with is obtained.

【0057】

In the nineteenth invention, there is a means for transmitting the second work key from the center device to the relay device on the third transmission line.

【0058】

As described above, in the nineteenth invention, since the second work key is transmitted from the center device to the relay device on the third transmission line, the second work key can be changed at any timing and immediately. The effect of being able to share with is obtained.

【0059】

In the twentieth invention, there is a means for transmitting the second work key from the center device to the relay device using the public network.

【0060】

As described above, in the twentieth invention, since the second work key is transmitted from the center device to the relay device using the public network, the second work key can be changed at any timing and shared immediately. The effect of being able to do it is obtained.

【0061】

In the twenty-first invention, the second work key is sent from one relay device to the center device by a storage medium, and the center device has a means of sending the received second work key to another relay device. ..

【0062】

As described above, in the 21st invention, the second work key is sent from one relay device to the center device by the storage medium, and the second work key is further sent from the center device to the other relay device. The effect is that the second work key can be shared easily and surely, and the relay device can independently change the second work key.

【0063】

In the 22nd invention, the first transmission line is capable of bidirectional communication, the second work key is transmitted from one relay device to the center device via the first transmission line, and the center device receives the key. It has a means of sending the second work key to another relay device. As described above, in the 22nd invention, the second work key is transmitted from one relay device to the center device through the first transmission line, and the center device sends the second work key to the other relay device. Therefore, the effect that the second work key can be changed at an arbitrary timing, can be shared immediately, and the relay device can independently change the second work key can be obtained.

【0064】

In the 23rd invention, the third transmission line is capable of bidirectional communication, and the second work key is transmitted from one relay device to the center device via the third transmission line, and the center device receives the key. It has a means of sending the second work key to another relay device. As described above, in the 23rd invention, the second work key is transmitted from one relay device to the center device through the third transmission line, and the center device sends the second work key to the other relay device. Therefore, the effect that the second work key can be changed at an arbitrary timing, can be shared immediately, and the relay device can independently change the second work key can be obtained.

【0065】

In the twenty-fourth invention, there is a means in which the second work key is transmitted from one relay device to the center device using the public network, and the center device sends the received second work key to the other relay device. doing.

【0066】

As described above, in the 24th invention, the second work key is transmitted from one relay device to the center device using the public network, and the center device sends the second work key to the other relay device. Therefore, the effect that the second work key can be changed at an arbitrary timing, the second work key can be shared immediately, and the relay device can independently change the second work key can be obtained.

【0067】

In the 25th invention, the center device or the relay device has a means of encrypting and transmitting the second work key by using the private key encryption method.

【0068】

As described above, in the 25th invention, since the center device or the relay device encrypts and transmits the second work key using the private key, the second work key is safely shared. The effect of being able to do is obtained.

【0069】

In the 26th invention, the center device or the relay device has a means of encrypting and transmitting the second work key by using a public key cryptosystem.

【0070】

As described above, in the 26th invention, since the center device or the relay device encrypts and transmits the second work key using the public key, the second work key is safely shared. The effect of being able to do is obtained.

【0071】

In the 27th invention, the center device stores and sends out the telephone number of the first viewing history collection destination in the second common information as needed, and the relay device sends out the second individual information as needed. The terminal device has a means of storing and transmitting the telephone number of the second viewing history collection destination, and transmitting the viewing history by preferentially using the telephone number of the first viewing history collection destination. There is.

【0072】

As described above, in the 27th invention, the center device stores and sends out the telephone number of the first viewing history collection destination in the second common information as needed, and the relay device second as needed. Since the telephone number of the second viewing history collection destination is stored in the individual information of and sent out, the terminal device preferentially uses the telephone number of the first viewing history collection destination to transmit the viewing history. , The effect that the viewing history can be collected at any viewing history collection destination can be obtained.

【0073】

In the 28th invention, the common information removing device is installed in the relay device and has a means of removing the first common information from the information including the contents.

【0074】

As described above, in the 28th invention, since the common information removing device removes the first common information from the information including the contents, the first common information unnecessary for the second terminal device on the second transmission path is used. Since the common information of the above is lost, the effect of preventing the malfunction of the second terminal device can be obtained.

【0075】

In the 29th invention, the common information multiplexing device is installed in the relay device, and the first common information of the information including the contents received from the first transmission line and the second common information received from the third transmission line are provided. It has a means of exchanging with.

【0076】

As described above, in the 29th invention, the common information multiplexing device has the first common information of the information including the contents received from the first transmission line and the second common information received from the third transmission line. Since the information is replaced, the effect of being able to relay to the second transmission line without increasing the transmission capacity of the information including the content on the first transmission line can be obtained.

【0077】

In the thirtieth invention, the individual information removing device is installed in the relay device and has a means of removing the first individual information from the information including the contents.

【0078】

As described above, in the thirtieth invention, since the individual information removing device removes the first individual information from the information including the contents, the transmission capacity of the information transmitted to the second transmission line can be increased. Since the second terminal device does not have unnecessary first individual information, the effect of preventing malfunction of the second terminal device can be obtained.

【0079】

In the thirty-first invention, the individual information multiplexing device is installed in the relay device, and has means for exchanging the first individual information and the second individual information in the information including the contents.

【0080】

As described above, in the thirty-first invention, the individual information multiplexing device exchanges the first individual information and the second individual information in the information including the content and transmits the second individual information, so that the content on the first transmission line is transmitted. It is possible to obtain the effect of being able to relay to the second transmission line without increasing the transmission capacity of the information including.

【0081】

In the 32nd invention, the common information multiplexing device is installed in the relay device, and has a means of repeatedly transmitting the received second common information until the next modified second common information is received. There is.

【0082】

As described above, in the 32nd invention, the common information multiplexing device repeatedly transmits the received second common information until the next modified second common information is received. It is possible to increase the transmission capacity of the contents on the transmission path of the above, and it is possible to obtain the effects of further improving the image quality of the contents and increasing the number of channels.

【0083】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments, and can be implemented in various embodiments without departing from the gist thereof.

【0084】

(First Embodiment) In the first embodiment, a digital broadcasting system that relays and broadcasts satellite broadcasting by a CATV station, which is an example of a limited reception system, will be described.

【0085】

FIG. 1 is a block diagram showing an overall configuration of the limited reception system according to the present embodiment.

【0086】

The broadcasting center 101 and the CATV station 105 are connected by a satellite line 102 using an artificial satellite 103, and the broadcasting center 101 and the direct receiving terminal 104 are also connected by a satellite line 102. Further, the CATV station 105 and the CATV terminal 107 are connected by the CATV line 106.

【0087】

The broadcasting center sends a broadcast radio wave to the satellite line 102, and the direct receiving terminal 104 receives the radio wave directly from the satellite line 102. The CATV station 105 relays the broadcast radio wave received from the satellite line 102 to the CATV line 106, and the CATV terminal 107 receives the broadcast radio wave from the CATV line 106.

【0088】

FIG. 2 is an example of a block diagram showing a main part of the internal configuration of the broadcasting center 101.

【0089】

The broadcasting center 101 includes a content server 201 that sends out contents including video and audio, a first Kw management unit 203 that holds the first Kw (work key), and a second Kw that holds the second Kw. The first EMM that stores the contract information of the Kw management unit 206 and the first Kw and the direct receiving terminal 104 in the first EMM (individual information) and encrypts it with the Kmi (individual key) unique to the direct receiving terminal device. The generation unit 202, the Ks generation unit 208 that generates Ks (scramble key) at regular intervals, and the viewing judgment information of Ks and the content to be limited reception are stored in the first ECM, and the first Kw is used. The first ECM generation unit 204 that encrypts the content, and the second ECM generation that stores the viewing judgment information of Ks and the content subject to limited reception in the second ECM and encrypts it using the second Kw. Unit 205 and Ks are transmitted to the first ECM generation unit 204 and the second ECM generation unit 205, and the packet identifier (PID) of Ks and the content to be scrambled is transmitted to the scrambler 210. A simulcrypt control unit 207 that transmits the first ECM and the second ECM input from the ECM generation unit 204 and the second ECM generation unit 205 to the multiplexing unit 209, and the content, the first EMM, the first ECM, and the first ECM. Multiplex section 209 that multiplexes the second ECM and outputs it as a transport stream, scrambler 210 that scrambles the packets of the content in the transport stream using Ks, and processing such as modulation according to the satellite line 102. It is provided with a transmission unit 211 to perform the transmission and a transmission antenna 212 to transmit a transport stream as a broadcast radio wave to the satellite line 102.

【0090】

The content server 201 transmits content including video and audio to the multiplexing unit 209 in the MPEG2 standard transport stream format. The first Kw management unit 203 holds the first Kw and transmits the first Kw to the first EMM generation unit 202 and the first ECM generation unit 204, and the first EMM generation unit 202 The contract information of the first Kw and the direct receiving terminal 104 is stored in the first EMM, and the area to be encrypted of the first EMM is encrypted with the Kmi (individual key) unique to the direct receiving terminal device, and the multiplex unit is used. Send to 209. The second Kw management unit 206 holds the second Kw and transmits the second Kw to the second ECM generation unit 205, the Ks generation unit 208 generates Ks at regular intervals, and the simulcrypt control unit 207. Send to. The simulcrypt control unit 207 transmits Ks to each of the first ECM generation unit 204 and the second ECM generation unit 205, and the first ECM generation unit 204 determines viewing of the Ks and the content to be limitedly received. The information is stored in the first ECM, and the area to be encrypted in the first ECM is encrypted using the first Kw and transmitted to the simulcrypt control unit 207. The second ECM generation unit 205 stores the viewing determination information of Ks and the content to be limited reception in the second ECM, and uses the second Kw to encrypt the area to be encrypted in the second ECM. It is converted and transmitted to the simulcrypt control unit 207. The simulcrypt control unit 207 transmits Ks and the packet identifier (PID) of the content to be scrambled to the scrambler 210, and transmits the first ECM and the second ECM to the multiplexing unit 209. The multiplexing unit 209 multiplexes the received content, the first EMM, the first ECM, and the second ECM, and transmits them to the scrambler 210 as one transport stream. Based on the PID received from the Simulcrypt control unit 207, the scrambler 210 scrambles the packet of the corresponding content in the transport stream using Ks and transmits it to the transmission unit 211. Transmitter 211 is modulated according to satellite line 102

【0091】

FIG. 3 is an example of a block diagram showing a main part of the internal configuration of the CATV station 105.

【0092】

The CATV station 105 includes a receiving antenna 301 that receives broadcast radio waves from the satellite line 102, a receiving unit 302 that performs processing such as demolishing the received signal, and a PSI conversion unit 303 that converts NIT from satellite transmission to cable transmission. , Transfer the contract information of the second Kw management unit 307, which holds the same second Kw as the second Kw management unit 206 of the broadcasting center 101, and the second Kw and CATV terminal 107 to the second EMM. Multiplexing the second EMM generator 308, which stores and encrypts with the Kmi unique to the CATV terminal 107, and the transport stream input from the PSI converter 303, to multiplex the second EMM into one transport stream. Section 304, QAM modulation section 305 that modulates the transport stream according to the CATV line 106, frequency conversion section 306 that converts the transport stream to the frequency band to be transmitted, and transmission of the transport stream to the CATV line 106. It is provided with a mixing unit 309.

【0093】

The receiving unit 302 receives the broadcast radio wave from the satellite line 102 via the receiving antenna 301, performs processing such as demodulation, and transmits the transport stream to be relayed to the PSI conversion unit 303. The PSI conversion unit 303 is a part of program sequence information (PSI), and NIT (Network_Information_Table) for transmitting information that associates transmission line information such as modulation frequency with content is used for cable transmission from satellite transmission. Is converted to and transmitted to the multiplexing unit 304. The second Kw management unit 307 holds the same second Kw as the second Kw management unit 206 in the broadcasting center 101, and transmits the second Kw to the second EMM generation unit 308. The second EMM generator 308 stores the contract information of the second Kw and the CATV terminal 107 in the second EMM, and encrypts the area to be encrypted of the second EMM with the Kmi unique to the CATV terminal 107. , Transmit to the multiplex 304. The multiplexing section 304 further multiplexes the second EMM to the transport stream to form one transport stream and transmits it to the QAM modulation section 305, and the QAM modulation section 305 modulates the transport stream according to the CATV line 106. It is transmitted to the frequency conversion unit 306, the frequency conversion unit 306 converts the transport stream into the frequency band to be transmitted and transmits it to the mixing unit 309, and the mixing unit 309 mixes the necessary information (in the case of this figure). (There is no particular information to be mixed) The transport stream is sent to the CATV line 106.

【0094】

FIG. 4 is an example of a block diagram showing a main part of the internal configuration of the direct receiving terminal 104.

【0095】

The direct receiving terminal 104 includes a tuner 402 that receives broadcast radio waves selected from the satellite line 102 via the receiving antenna 401, a demodulation unit 403 that demodulates the received transport stream, and the first EMM from the transport stream. And the separation unit 404 that separates the first ECM and others, the first EMM is decoded to extract the contract information and the first Kw, and the first ECM is decoded with the first Kw for viewing judgment. A limited access module 405 that extracts information and Ks, a descrambler 406 that descrambles packets of content in a transport stream using the extracted Ks, and an output control unit that converts content into a signal according to the output form. It is equipped with 407.

【0096】

The tuner 402 of the direct receiving terminal 104 receives the broadcast radio wave from the satellite line 102 via the receiving antenna 401, and transmits the transport stream to be received to the demodulation unit 403. The demodulation unit 403 performs demodulation processing corresponding to the transmission unit 211 in the broadcasting center 101 on the transport stream and transmits it to the separation unit 404, and the separation unit 404 separates the first EMM and the first ECM from the transport stream. And send it to the conditional access module 405 and send the rest of the transport stream to the descrambler 406. The limited reception module 405 decodes using Kmi that holds the first EMM in advance, extracts and holds the contract information and the first Kw, and uses the first Kw when the first ECM is received. Decoding, extracting viewing judgment information and Ks, comparing the contract information with the viewing judgment information, and transmitting Ks to the descrambler 406 when it is determined that viewing is possible. The descrambler 406 descrambles the packet of the content in the transport stream using Ks and sends it to the output control unit 407, and the output control unit 407 converts the content into a signal according to the output form. For example, when outputting to a television, it is converted into a television signal and transmitted.

【0097】

FIG. 5 is an example of a block diagram showing a main part of the internal configuration of the CATV terminal 107.

【0098】

The CATV terminal 107 has a tuner 502 that receives a broadcast signal from the CATV line 106, a demodulation unit 503 that demodulates the received transport stream, and a second EMM, a second ECM, and others from the transport stream. The separation unit 504 to be separated and the limited reception module that decodes the second EMM to extract the contract information and the second Kw, and decodes the second ECM with the second Kw to extract the viewing judgment information and Ks. It includes a 505, a descrambler 506 that descrambles a packet of contents in a transport stream using the extracted Ks, and an output control unit 507 that converts the contents into a signal according to an output form.

【0099】

The tuner 502 of the CATV terminal 107 receives a broadcast signal from the CATV line 106, and transmits a transport stream to be received to the demodulation unit 503. The demodulation unit 503 performs demodulation processing corresponding to the QAM modulation unit 305 in the CATV station 105 on the transport stream and transmits it to the separation unit 504, and the separation unit 504 transmits the second EMM and the second ECM from the transport stream. Separately send to the conditional access module 505 and send the remaining transport stream to the descrambler 506. The limited reception module 506 decodes using Kmi which holds the second EMM in advance, extracts and holds the contract information and the second Kw, and uses the second Kw when the second ECM is received. Decoding, extracting viewing judgment information and Ks, comparing the contract information with the viewing judgment information, and transmitting Ks to the descrambler 506 when it is determined that viewing is possible. The descrambler 506 descrambles the packet of the content in the transport stream using Ks and sends it to the output control unit 507, and the output control unit 507 converts the content into a signal according to the output form, for example. , When outputting to a TV, it is converted to a TV signal and sent out.

【0100】

The operation of the limited reception system having the above configuration will be described below.

【0101】

In the broadcasting center 101, the content server 201 shall send one or more contents, and this contents are in the transport stream format of MPEG2, all the audio and video contained in the contents are transmitted in the packet format, and further. One or more contents are contained in one transport stream, and each content is represented as a channel. It is assumed that the content server 201 also sends a PSI (program sequence information) for expressing the configuration of this channel, that is, the configuration of packets included in each content.

【0102】

The first Kw management unit 203 transmits the first Kw and the paired KwID to the first EMM generation unit 202 and the first ECM generation unit 204.

【0103】

The first EMM generator 202 sends the first EMM to each direct receiving terminal 104. As shown in FIG. 6, the basic configuration of the EMM includes the terminal ID601, KwID602, Kw storage area 603, and contract information area 604. This basic configuration is common to the first EMM and the second EMM (generated by the CATV station), and to explain the first EMM, the terminal ID 601 is a terminal unique to each direct receiving terminal 104 that is the destination of the EMM. The ID (identification number) is stored, and when two or more primary Kw are required in KwID602, such as when changing the primary Kw, the KwID (work) for identifying each primary Kw is used. (Key identification) is stored, the first Kw itself that is paired with the KwID stored in KwID602 is stored in the Kw storage area 603, and the direct receiving terminal corresponding to the terminal ID stored in the terminal ID601 is stored in the contract information area 604. Stores 104 contract information. In addition, KwID602, Kw storage area 603, and contract information area 604 are encrypted with Kmi (individual key) unique to the direct receiving terminal 104 corresponding to the terminal ID. The first EMM generation unit 202 generates and sends out such a first EMM.

【0104】

The simulcrypt control unit 207 transmits Ks received from the Ks generation unit 208 to the first ECM generation unit 204 and the second ECM generation unit 205.

【0105】

The first ECM generation unit 204 generates and sends the first ECM attached to the content. As shown in FIG. 7, the basic configuration of the ECM includes a KwID701, a Ks storage area 702, and a viewing judgment area 703. This basic configuration is common to the first ECM and the second ECM, and to explain the first ECM, the KwID701 is the identifier of the first Kw that encrypts the first ECM, and is within the first EMM. Corresponds to KwID602 of. The Ks storage area 702 stores Ks for scrambling the content, and the viewing determination area 703 stores information for determining the viewing of the content. Further, the Ks storage area 702 and the viewing determination area 703 are encrypted using the first Kw paired with the KwID stored in the KwID701. The first ECM generation unit 204 generates such a first ECM and transmits it to the simulcrypt control unit 207.

【0106】

The second Kw management unit 206 transmits the second Kw and the paired KwID to the second ECM generation unit 205.

【0107】

The second ECM generation unit 205 generates and sends a second ECM attached to the content. Explaining the second ECM based on the ECM basic configuration of FIG. 7, KwID701 is an identifier of the second Kw, which corresponds to KwID602 in the second EMM and is the KwID stored in the first ECM. It does not have to be the same. The Ks storage area 702 stores Ks for scrambling the content, and in this case, stores the same Ks as the Ks stored in the first ECM. The viewing determination area 703 stores information for determining the viewing of the content, and in this case, it does not have to be the same as the viewing determination information stored in the first ECM. Further, the Ks storage area 702 and the viewing determination area 703 are encrypted using a second Kw paired with the KwID stored in the KwID701. The second ECM generation unit 205 generates such a second ECM and transmits it to the simulcrypt control unit 207.

【0108】

The simulcrypt control unit 207 transmits the packet identification (PID) and Ks of the content to be scrambled to the scrambler 210, and transmits the first ECM and the second ECM to the multiplexing unit 209.

【0109】

The multiplexing unit 209 multiplexes the content, the first EMM, the first ECM, and the second ECM into one transport stream and transmits it, and the scrambler 210 transmits the transport stream based on the specified PID. The packet of the content to be scrambled is scrambled and transmitted, and is transmitted to the satellite line 102 as a broadcast radio wave via the transmission unit 211 and the transmission antenna 212.

【0110】

In the CATV station 105, the PSI conversion unit 303 rewrites the NIT in the received transport stream. Specifically, the received NIT contains physical information of the transmission line such as the frequency band and the modulation method on the satellite line. It is described, and based on this information, it is possible to receive an appropriate transport stream from the broadcast radio wave. If this NIT is relayed to the CATV line 106 as it is, the transport stream cannot be received by the CATV terminal 107. Therefore, the NIT is changed from the content suitable for the satellite line 102 to the content suitable for the CATV line 106.

【0111】

The second Kw management unit 307 in the CATV station 105 manages the same second Kw as the second Kw management unit 206 in the broadcasting center 101, and the KwID and the second Kw are the second Kw. Send to EMM generator 308.

【0112】

The second EMM generation unit 308 sends a second EMM to each CATV terminal 107. Explaining the second EMM using FIG. 6, the terminal ID 601 stores the terminal ID unique to each CATV terminal 107 that is the destination of the second EMM, and the KwID 602 stores the second Kw when changing the second Kw. When two or more second Kw are required, the KwID for identifying each second Kw is stored, and the Kw storage area 603 is the second Kw itself that is paired with the KwID stored in KwID602. Is stored, and the contract information of the CATV terminal 107 corresponding to the terminal ID stored in the terminal ID 601 is stored in the contract information area 604. Further, the KwID602, the Kw storage area 603, and the contract information area 604 are encrypted with the Kmi unique to the CATV terminal 107 corresponding to the terminal ID. The second EMM generation unit 308 generates such a second EMM and sends it to the multiplexing unit 304.

【0113】

The multiplexing unit 304 further multiplexes the second EMM to the transport stream and sends it as one transport stream, and broadcast signals to the CATV line 106 via the QAM modulation unit 305, the frequency conversion unit 306, and the mixing unit 309. Send as.

【0114】

In the direct receiving terminal 104, the transport stream including the content to be viewed is received from the satellite line 102 via the receiving antenna 401, the tuner 402, and the demodulation unit 403, and the separation unit 404 is addressed to the first ECM and itself from the transport stream. The first EMM of is separated and sent to the conditional access module 405.

【0115】

The limited reception module 405 compares the contract information of the first EMM with the viewing determination information of the first ECM and transmits Ks to the descrambler 405 when it is determined that the viewing is possible.

【0116】

The flowchart shown in FIG. 8 shows the basic viewing determination processing, which is the basic processing of the limited receiving module 405 and the limited receiving module 505 (of the CATV terminal). First, the limited receiving module 405 will be described.

【0117】

The first EMM has been received in advance at the time of contract, and this is decrypted using Kmi to retain the KwID, the first Kw, and the contract information.

【0118】

Step 801: Receive the first ECM, and based on the KwID of the non-encrypting part, decrypt the cryptographic part using the corresponding first Kw.

【0119】

Step 802: If it is determined that the viewing is possible by comparing the decrypted viewing judgment information with the contract information held in advance, Step 803: Send Ks to Deskrambra 406.

【0120】

If it is determined in step 802 that viewing is not possible, Step 804: Handle errors, for example, reply that you are not contracted.

【0121】

Assuming that the determination method in step 802 is tier determination, a tier bit indicating contract information is described in the contract information area of the first EMM, and a tier indicating content viewing determination is described in the viewing determination area of the first ECM. Write a bit. When the viewing judgment area is described in tier bits, the configuration is as shown in FIG. 9, and when the contract information area is described in tier bits, the configuration is as shown in FIG. For example, the viewing judgment tier bit 901 of the first ECM attached to all contents belonging to professional baseball and the Hanshin Tigers has a corresponding bit of 1 as shown in Fig. 9, and the movie series A and Hanshin. As shown in Fig. 10, the corresponding bit is 1 in the contract information Tierbit 1001 of the first EMM when a battle is contracted. Then, when the first terminal device 104 having the contract information tier bit 1001 tries to view the content corresponding to the first ECM having the viewing judgment tier bit 901, the viewing judgment tier bit 901 and the contract information tier bit 1001 Bit comparison is performed with, and if there is an item in which each item is 1, it can be viewed. In other words, in this example, the items of the Hanshin Tigers are 1 each other, so they can be viewed. On the contrary, when the first terminal device 104 having the contract information 1001 tries to watch the content belonging to the professional baseball and the giant game, the viewing judgment tier bit of the content is only the item of the professional baseball and the giant game. Therefore, even if bit comparison is performed, there is no item that becomes 1 for each other, so it cannot be viewed. In addition, since the item of professional baseball is 1 in the contract information tier bit when contracting for professional baseball, both the contents belonging to the above professional baseball and Hanshin games and the contents belonging to professional baseball and giant games can be viewed. Become. When expressed in tier bits in this way, one item of tier bits may contain a plurality of contents, and one content may belong to a plurality of items.

【0122】

In the CATV terminal 107, the transport stream including the content to be viewed is received from the CATV line 106 via the tuner 502 and the demodulation unit 503, and the separation unit 504 receives the second ECM from the transport stream and the second EMM addressed to itself. Is separated and transmitted to the limited reception module 505.

【0123】

The limited reception module 505 compares the contract information of the second EMM with the viewing determination information of the first ECM and transmits Ks to the descrambler 506 when it is determined that the viewing is possible. Specifically, the determination process is the same as the flowchart of FIG. 8 shown above, and the second EMM has been received in advance, is decoded using Kmi, and holds the KwID, the second Kw, and the contract information. Keep it. In step 801, the second ECM is received, and the encryption unit is decrypted using the corresponding second Kw based on the KwID of the non-encryption unit. In step 802, if it is determined that viewing is possible by comparing the decrypted viewing judgment information with the contract information held in advance, the process proceeds to step 803, Ks is transmitted to the desk rambler 506, and it is determined that viewing is not possible. Then, the process proceeds to step 804, and error handling, for example, a reply that the contract is not made is performed. Assuming that the determination method in step 802 is a channel bitmap, a bitmap indicating the contract information is described in the contract information area of the second EMM, and the viewing determination of the content is indicated in the viewing determination area of the second ECM. Write a bitmap. When the viewing judgment area is described by a bitmap, the configuration is as shown in FIG. 11, and when the contract information area is described by a bitmap, the configuration is as shown in FIG. For example, in the viewing judgment bitmap 1101 of the content of channel 3 (CH3), only the corresponding item is 1 as shown in Fig. 11, and the contract information bitmap 1201 when CH2, CH3, and CHN are contracted is shown in Fig. The corresponding item is 1 as in 12. Then, when the CATV terminal 107 having the contract information bitmap 1201 tries to view the content corresponding to the second ECM having the viewing judgment bitmap 1101, a bit comparison is performed, and even one item is 1 for each. If there is an item, it can be viewed. In other words, in this example, the items of CH3 are 1 for each other, so that they can be viewed. Conversely, if the CATV terminal 107 with the contract information bitmap 1201 tries to watch CH1, the content of CH1 Since only CH1 is 1 in the viewing judgment bitmap of Tsu, even if bit comparison is performed, there is no item that makes each other 1 and it cannot be viewed. When expressed in a bitmap in this way, one item in the bitmap corresponds to one channel.

【0124】

As described above, according to the present embodiment, the broadcasting center 101 transmits the first ECM, the second ECM, and the first EMM together with the content, and the CATV station 105 multiplexes and relays the second EMM. Then, the direct receiving terminal 104 makes a viewing judgment for the content using the first ECM and the first EMM, and the CATV terminal 107 makes a viewing judgment for the content using the second ECM and the second EMM. Therefore, the effect that the broadcasting center 101 can directly manage the limited reception of the receiving terminal 104 and the CATV station 105 can independently manage the limited reception of the CATV terminal can be obtained. In addition, the CATV station 105 does not need to scramble the content or decrypt the first ECM, the second ECM, and the first EMM when relaying the information including the content, so the relay is relayed with a simple configuration. This makes it possible to reduce the cost of equipment. Further, since the viewing determination of the direct receiving terminal 104 can be used as a tier bit and the viewing determination of the CATV terminal 107 can be used as a bitmap, the CATV station 105 can be operated more independently.

【0125】

In the present embodiment, if the encryption methods performed by the first ECM generation unit 204 and the second ECM generation unit 205 are different, even if one of the encryption methods is broken, it is already possible. Since one can be operated without any influence, the CATV station 105 can operate the limited reception more independently.

【0126】

Further, if the encryption methods performed by the first EMM generation unit 202 and the second EMM generation unit 308 are different, even if one of the encryption methods is broken, the other can be operated without any influence. Therefore, the CATV station 105 can operate the limited reception more independently.

【0127】

Further, the basic configuration diagram of the EMM shown in FIG. 6 is just basic, and the first EMM and the second EMM do not have to be in the same format, and can be realized in different formats. In that case, the CATV station 105 can operate the limited reception more independently.

【0128】

Similarly, the basic configuration diagram of the ECM shown in FIG. 7 is also basic, and the first ECM and the second ECM do not have to be in the same format, and can be realized in different formats. In this case, the CATV station 105 can operate the limited reception more independently.

【0129】

Further, in the present embodiment, the viewing determination of the direct receiving terminal 104 is a tier bit, and the viewing determination of the CATV terminal 107 is a bitmap. However, each viewing determination may be performed in the reverse manner, or either one of them may be used. The method may be used, and further, it is possible to combine a tear bit and a bitmap, and various operations are possible. Further, the limited reception modules 405 and 505 may be a built-in chip or the like, or may be a removable IC card or a PCMCIA card.

【0130】

As a method of sharing the same second Kw between the second Kw management unit 206 in the broadcasting center 101 and the second Kw management unit 307 in the CATV station 105, the second Kw management unit 206 Writes the second Kw to a storage medium such as a floppy or IC card, sends it to the CATV station 105, and the second Kw management unit 307 reads it from the storage medium, so that the second Kw can be shared. On the contrary, the second Kw management unit 307 of the CATV station 105 may write the second Kw to the storage medium, send it to the broadcasting center 101, and the second Kw management unit 206 may read the storage medium. .. In this case, when a plurality of CATV stations 105 are connected to the broadcasting center 101, a storage medium is sent from one CATV station 105 to the broadcasting center 101, and the broadcasting center 101 goes to the other CATV station 105. There is also a way to send it. There is also a method of sending a storage medium from one CATV station 105 to the broadcasting center 101 and another CATV station 105.

【0131】

As another method of sharing the second Kw, it is assumed that the second Kw management unit 206 is connected to the transmission unit 211 in the broadcasting center 101, and the satellite is transmitted via the transmission unit 211 and the transmission antenna 212. The second Kw is transmitted to the line 102, and the CATV station 105 receives the second Kw via the receiving antenna 301 and the receiving unit 302, assuming that the second Kw management unit 307 is connected to the receiving unit 302. There is also a way to do it. If the transmitting antenna 212, the receiving antenna 301, and the satellite line 102 are capable of bidirectional communication, the second Kw management unit 307 of the CATV station 105 transmits the second Kw to the satellite line 102, and the broadcasting center. There is also a method in which the second Kw management unit 206 of 101 receives the second Kw via the satellite line 102. In this case, when a plurality of CATV stations 105 are connected to the broadcasting center 101, a second Kw is transmitted from one CATV station 105 to the broadcasting center 101 via the satellite line 102 and broadcast. There is also a method in which the center 101 transmits to another CATV station 105 via the satellite line 102. There is also a method of transmitting from one CATV station 105 to the broadcasting center 101 and another CATV station 105 via the satellite line 102. When using this satellite line 102, the second Kw may be stored in the EMM addressed to the CATV station 105 and transmitted.

【0132】

As another method of sharing the second Kw, it is assumed that the second Kw management unit 206 of the broadcasting center 101 and the second Kw management unit 307 of the CATV station 105 are connected by a public network. , There is a way to share via the public network. Similar to the above two methods, this method also transmits from the broadcasting center 101 to the CATV station 105, and transmits from one CATV station 105 to the broadcasting center 101, and the broadcasting center 101 transmits to the other CATV station 105. There is a method and a method of transmitting from one CATV station 105 to a broadcasting center 101 and another CATV station 105.

【0133】

In addition, when sending the second Kw using a storage medium, satellite line 102, or public network, confidentiality is improved by encrypting the second Kw using a private key cryptosystem or a public key cryptosystem. It is possible to improve.

【0134】

(Second Embodiment) FIG. 13 is an example showing the configuration of the main part of the multiplex part 304 in the CATV station 105.

【0135】

The multiplexing unit 304 includes a common information removing device 1301 and a multiplexing device 1302, the common information removing device 1301 receives a transport stream from the PSI conversion unit 303 and removes the first ECM, and the multiplexing device 1302 removes the first ECM. The transport stream from which the first ECM has been removed is multiplexed with the second EMM and transmitted to the QAM modulator 305. Since the other configurations of the broadcasting center 101 and the CATV station 105 and the configurations of the direct receiving terminal 104 and the CATV terminal 107 are the same as those of the first embodiment, the operation will be described below by diverting them.

【0136】

As a method for the common information removal device 1301 to remove the first ECM from the transport stream, since the first ECM and the second ECM are all in the packet format of the MPEG2 transport stream, as shown in FIG. A PID (packet identifier), which is a number for identifying the packet type, is assigned to the TS packet header 1401. Therefore, it can be easily removed by setting the PIDs of the first ECM and the second ECM to different values.

【0137】

As another removal method, when the PIDs of the first ECM and the second ECM have the same value, the ECM identifier 1501 is provided in the non-encryption part of the ECM as shown in FIG. 15, and the value of the ECM identifier 1501 is provided. If the first ECM and the second ECM have different values, it is possible to easily remove the ECM without decoding it.

【0138】

As described above, according to the present embodiment, since the common information removal device 1301 removes the first ECM, unnecessary information is not sent to the CATV terminal 107, and the CATV terminal 107 does not flow. It leads to the prevention of malfunction of the above, and further, the effect that the transmission capacity other than the first ECM can be increased on the CATV line 106 can be obtained.

【0139】

The video and audio include time information for playback, but when the common information removal device 1301 removes the first ECM, the difference is reflected in the time information and recalculated. This may be done as needed, and in this way, it can be removed without affecting the reproduction of the content.

【0140】

Further, the common information removal device 1301 may replace the first ECM with empty information (null packet) instead of removing the first ECM, and in this case, it leads to prevention of malfunction of the CATV terminal 107.

【0141】

(Third Embodiment) FIG. 16 is an example showing the configuration of the main part of the multiplex portion 304 in the CATV station 105.

【0142】

The multiplexing unit 304 includes the individual information removing device 1601 and the multiplexing device 1602, and the individual information removing device 1601 receives the transport stream from the PSI conversion unit 303, removes the first EMM, and transmits the transport stream to the multiplexing device 1602. Then, the multiplexing device 1602 multiplexes the second EMM on the transport stream and transmits it to the QAM modulator 305. Since other configurations are the same as those of the first embodiment, the operation will be described below by diverting them.

【0143】

As a method for the individual information removal device 1601 to remove the first EMM from the transport stream, since the first EMM and the second EMM are in the packet format of the MPEG2 transport stream, their PIDs should be set to different values. It can be easily removed.

【0144】

As another removal method, when the PIDs of the first EMM and the second EMM have the same value, the EMM identifier 1701 is provided in the non-encryption part of the EMM as shown in FIG. 17, and the value of the EMM identifier 1701 is provided. If the first EMM and the second EMM have different values, the EMM can be easily removed without decoding.

【0145】

FIG. 18 is a diagram illustrating the operation of the multiplexing device 1602. The multiplexing device 1602 has a buffer of one or more packets, and checks the types of packets while storing the transport stream in the buffer and sends them out in sequence. It also has one or more packets holding the second EMM received from the second EMM generator 308. Then, when a null packet (empty information) is detected in the transport stream when the second EMM is held, the held second EMM and the null packet are exchanged and transmitted.

【0146】

As described above, according to the present embodiment, since the individual information removal device 1601 removes the first EMM, unnecessary information is not sent to the CATV terminal 107, and the CATV terminal 107 does not flow. This leads to the prevention of malfunction, and further, the effect that the transmission capacity other than the first EMM can be increased on the CATV line 106 can be obtained.

【0147】

Also, since the multiplexing device 1602 replaces the second EMM with a null packet and transmits it, the multiplexing device 1602 can multiplex the second EMM without changing the transmission speed of the transport stream. ..

【0148】

The video and audio include time information for playback, but when the individual information removal device 1601 removes the first EMM, the difference is reflected in the time information and recalculated. This may be done as needed, and in this way the content can be removed without affecting the reproduction of the content.

【0149】

In addition, the time that the multiplexing device 1602 holds the transport stream is reflected in the time information for playback and recalculated, which does not affect the playback of the content if necessary. ..

【0150】

Further, the individual information removal device 1601 may replace the first EMM with a null packet instead of removing it, and in this case, it leads to prevention of malfunction of the CATV terminal 107.

【0151】

In addition, the multiplexing device 1602 has assumed that the second EMM is replaced with a null packet and transmitted, but it is also possible to replace not only the null packet but also the first ECM and transmit. The effect is that the transmission capacity of the second EMM can be increased without changing the transmission rate of the port stream.

【0152】

(Fourth Embodiment) FIG. 19 is an example showing the configuration of the main part of the multiplex part 304 in the CATV station 105.

【0153】

The multiplexing unit 304 includes an individual information multiplexing device 1901, and the individual information multiplexing unit 1901 receives a transport stream from the PSI conversion unit 303 and also receives a second EMM from the second EMM generating unit 308 and transports. Swap the first EMM and the second EMM in the stream and send. Since other configurations are the same as those of the first embodiment, the operation will be described below by diverting them.

【0154】

FIG. 20 is a diagram illustrating the operation of the individual information multiplexing device 1901. The individual information multiplexing device 1901 has a buffer of one or more packets, and checks the packet type while storing the transport stream in the buffer and sends them out in sequence. It also has one or more packets holding the second EMM received from the second EMM generator 308. Then, when the first EMM is detected in the transport stream when the second EMM is held, the held second EMM and the first EMM are exchanged and transmitted. Further, when the second EMM is not held, the information unnecessary for the CATV terminal 107 can be deleted by replacing the first EMM with a null packet.

【0155】

As described above, according to the present embodiment, the individual information multiplexing device 1901 transmits the second EMM or a null packet instead of the first EMM, so that the individual information multiplexing device 1901 is a transformer. It is possible to multiplex the second EMM without changing the transmission speed of the port stream, and it is also possible to delete the first EMM that is not necessary for the CATV terminal 107, so that the CATV terminal 107 malfunctions. The effect of being able to prevent it is obtained.

【0156】

In the present embodiment, the individual information multiplexing device 1901 replaces the second EMM with the first EMM, but the second EMM may be replaced with a null packet or the first ECM. This allows the transmission capacity of the second EMM to be increased without changing the transmission rate of the transport stream. Further, in this case, when the second EMM is not held, the first ECM may be replaced with a null packet, which leads to prevention of malfunction of the CATV terminal 107.

【0157】

Further, the time information for reproducing the video or audio may be recalculated as needed.

【0158】

(Fifth Embodiment) FIG. 21 is an example showing the configuration of the main part of the multiplex part 304 in the CATV station 105.

【0159】

The multiplexing unit 304 includes a common information multiplexing device 2101 and a multiplexing device 2102, and when the common information multiplexing device 2101 receives a transport stream from the PSI conversion unit 303 and receives a second ECM, it receives the second ECM, which is next to the second ECM. Until the ECM is received, it is repeatedly transmitted to the multiplexing device 2102 at regular intervals. The multiplexing device 2102 multiplexes and transmits this second EMM to the transport stream. Since other configurations are the same as those of the first embodiment, the operation will be described below by diverting them.

【0160】

FIG. 22 is a diagram showing the reception timing and the transmission timing of the second ECM in the common information multiplexing device 2101.

【0161】

Normally, the broadcasting center 101 updates Ks (scramble key) at regular intervals, changes the first ECM each time, and sends it out. Since the content cannot be viewed unless the direct receiving terminal 104 receives Ks normally, the first ECM of the same content is transmitted several times during the Ks update interval. .. For example, the Ks update interval is set to 3 seconds, the first ECM transmission interval is set to 500 milliseconds, and so on. The first ECM transmission interval is set shorter than the Ks update interval.

【0162】

Similarly, since it is necessary for the CATV terminal 107 to receive Ks normally, it is necessary to perform the second ECM several times during the Ks update interval. Therefore, as shown in FIG. 22, the broadcasting center 101 transmits once for each Ks update, that is, the second ECM update, and the second is until the common information multiplexing device 2101 receives the next second ECM. Retransmit the ECM of. In this way, the transmission capacity of information other than the second ECM on the satellite line 102 can be increased as compared with the case where the broadcasting center 101 retransmits the second ECM, and the CATV terminal 107 also normally sets Ks. The effect of being able to receive is obtained.

【0163】

When retransmitting the second ECM, the patrol counter of the TS packet header 1401 shown in FIG. 14 is sequentially updated.

【0164】

Further, as a method of terminating the second ECM retransmission process, there is a method of terminating when the next second ECM is not received within a period longer than the above-mentioned fixed interval. Another method is to provide an identifier indicating that it is the last ECM in the non-encrypted area of the second ECM. Alternatively, the item indicating the scramble control of the TS packet header 1401 such as the corresponding video or audio is checked, and when it is determined that the scramble is not performed, the transmission of the corresponding second ECM is terminated. There is also a method called.

【0165】

As described above, according to the present embodiment, the broadcasting center 101 transmits the second ECM only once for each update, and the common information multiplexing device 2101 of the CATV station 105 retransmits the second ECM. Since this is done, the effect of increasing the transmission capacity of information other than the second ECM on the satellite line 102 can be obtained.

【0166】

When the common information multiplexing device 2101 retransmits the second ECM, it may be replaced with the first ECM, the first EMM, or a null packet for transmission.

【0167】

In addition, FIG. 23 is a diagram showing a main part of the second ECM format.

【0168】

As shown in FIG. 23, a program attribute 2301 indicating whether the viewing judgment performed by the CATV terminal 107 is a tier judgment or a PPV (pay-per-view) judgment is provided in the non-encryption part of the second ECM, and the broadcasting center 101 provides the program attribute 2301. Tier information 2304 and PPV (pay-per-view) information 2305 are stored in the viewing judgment area, and are transmitted without specifying a judgment method in the program attribute 2301. When the common information multiplexing device 2101 receives the second ECM, it changes the program attribute 2301 to a value indicating either tier judgment, PPV judgment, or both, and sends it, depending on the operation method of the corresponding content.

【0169】

The CATV terminal 107 checks the program attribute 2301, and if it is a tier judgment, it compares the contract information tier bit with the tier information 2304 of the second ECM to make a viewing judgment, and if it is a PPV judgment, it is a PPV. The viewing judgment is made by comparing the contract information with the PPV information 2305. When the program attribute 2301 indicates both the tier determination and the PPV determination, viewing is possible if it is determined that viewing is possible in either viewing determination.

【0170】

In this way, the program attribute 2301 is provided in the second ECM, the broadcasting center 101 stores the tier information 2304 and the PPV information 2305 in the second ECM and sends them out, and the common information multiplexing device 2101 has the program attribute according to the operation. Since 2301 has been changed, the CATV station 105 has the effect of being able to operate more independently and flexibly.

【0171】

When a plurality of CATV stations 105 are connected to the broadcasting center 101, one CATV station 105 can operate a certain content in a tier, and another CATV station 105 can operate the same content in a PPV. In this way, the effect of flexible operation can be obtained.

【0172】

(6th Embodiment) FIG. 24 is a diagram showing a main part of the format of the second ECM. Since the system configuration is the same as that of the fifth embodiment, the operation will be described below by diverting it.

【0173】

As shown in FIG. 24, the broadcasting center 101 stores and transmits Ks2402 in the second ECM and KwID2401 of the second Kw in which the encryption unit is encrypted. In the CATV station 105, the common information multiplexing device 2101 shown in FIG. 21 adds a viewing judgment area 2403 unique to the CATV station 105 and transmits a second ECM.

【0174】

As described above, according to the present embodiment, since the common information multiplexing device 2101 additionally transmits the CATV station 105's own viewing judgment area 2403 to the second ECM, the CATV station 105 becomes more independent. Therefore, limited reception can be controlled.

【0175】

Further, FIG. 25 is a diagram showing a main part of a format which is another example from the above when the common information multiplexing device 2101 transmits the second ECM. FIG. 26 is a diagram showing a main part of the format of the second EMM to be transmitted to the CATV terminal 107.

【0176】

As shown in FIG. 25, the common information multiplexing device 2101 adds the viewing judgment area 2403 to the second ECM, and sets the area including the KwID2401 and Ks2402 of the second Kw and the viewing judgment area 2403 as the third Kw. It is encrypted using, and KwID2501 of the third Kw is added to the second ECM and transmitted. In this way, the confidentiality of the viewing determination area 2403 can be ensured.

【0177】

At this time, it is necessary to notify the CATV terminal 107 of the third Kw, but as shown in FIG. 26 from the second EMM generation unit 308 of the CATV station 105, the second EMM corresponds to the third Kw2605. Stores and sends KwID2604 of the third Kw. Since the CATV terminal 107 can know the third Kw by this, the second EMM shown in FIG. 25 can be decoded, and limited reception becomes possible.

【0178】

As described above, the CATV station 105 can control the limited reception more independently, and the effect that the confidentiality of the viewing determination area 2403 can be secured can be obtained.

【0179】

(7th Embodiment) FIG. 27 is an example of a diagram showing a main part of the internal configuration of the CATV station 105.

【0180】

This CATV station 105 uses a modulation section 2710 that modulates the second EMM and a frequency that converts the frequency of the second EMM generated by the second EMM generation section 2707, instead of multiplexing the second EMM into a stream through the multiplex section. It is equipped with a conversion unit 2708, and after modulation and frequency conversion of the second EMM, it is mixed with the stream in the mixing unit 2709.

【0181】

In this CATV station 105, the receiving unit 2702 receives the transport stream relayed from the satellite line 102 and transmits it to the PSI conversion unit 2703, and the PSI conversion unit 2703 transmits the NIT to the CATV line as in the first embodiment. The content is changed to suit the 106 and transmitted to the QAM modulation unit 2704, the QAM modulation unit 2704 performs modulation suitable for the CATV line 106 and transmits it to the frequency conversion unit 2705, and the frequency conversion unit 2705 transports the content. The stream is converted into the corresponding frequency band on the CATV line 106 and transmitted to the mixing unit 2709.

【0182】

Further, the second Kw management unit 2706 transmits the second Kw to the second EMM generation unit 2707, and the second EMM generation unit 2707 generates the second EMM and transmits it to the modulation unit 2710 for modulation. The unit 2710 performs appropriate modulation and transmits it to the frequency conversion unit 2708, and the frequency conversion unit 2708 converts the second EMM into the corresponding frequency band on the CATV line 106 and transmits it to the mixing unit 2709. The mixing unit 2709 frequency-multiplexes the frequency-converted transport stream and the second EMM and sends them to the CATV line 106.

【0183】

Since other system configurations are the same as those of the first embodiment, the operation will be described below by diverting the drawings.

【0184】

FIG. 28 is an example of a diagram showing a frequency arrangement in the CATV line 106.

【0185】

As shown in FIG. 28, a frequency band for transmitting the transport stream including the content and a frequency band for transmitting the second EMM are provided separately.

【0186】

At the CATV station 105, the frequency converter 2705 converts the transport stream containing the content to the corresponding frequency, and the frequency converter 2708 converts the second EMM to a frequency band 2801 different from the transport stream containing the content. And send it out.

【0187】

When the CATV terminal 107 receives the second EMM, it receives the frequency band 2801 for the second EMM as necessary, receives the second EMM addressed to itself, and retains contract information and the like. To do. When viewing the content, the transport stream containing the corresponding content is received, the second ECM corresponding to the corresponding content is received, and the contract information of the second EMM received earlier is received. The viewing determination may be made in comparison with.

【0188】

As described above, according to the present embodiment, in the CATV station 105, the frequency conversion unit 2708 transmits the second EMM using a frequency band different from the frequency band for the transport stream including the content. Therefore, the CATV station 105 has the effect of being able to transmit the second EMM at any time without worrying about the transmission capacity of the transport stream containing the content and without affecting the content. can get.

【0189】

FIG. 29 is another example of a diagram showing a main part of the internal configuration of the CATV terminal 107 in the present embodiment.

【0190】

This CATV terminal 107 has a demodulation unit 2908 that demodulates the second EMM, a distribution unit 2901 that distributes the frequency band 2801 for the second EMM to the demodulation unit 2908, and a second EMM that is addressed to itself. It is equipped with a second EMM extraction unit 2909.

【0191】

In this CATV terminal 107, the distribution unit 2901 distributes the frequency band 2801 for the second EMM from the signal of the CATV line 106 to the demodulation unit 2908, and transmits the remaining signal to the tuner 2902. The demodulation unit 2908 demodulates the second EMM and sends it to the second EMM extraction unit 2909, and when the second EMM extraction unit 2909 receives the second EMM addressed to itself, it goes to the limited reception module 2905. Send a second EMM addressed to you. The separation unit 2903 receives the transport stream including the content to be viewed via the tuner 2902 and the demodulation unit 2903, and transmits the second ECM to the limited reception module 2905. When the limited reception module 2905 receives the second EMM, it retains the contract information, Kw, etc., and when it receives the second ECM, it makes a viewing judgment using the retained contract information. , If available, send the Ks contained in the second ECM to the descrambler 2906. The descrambler 2906 scrambles the content based on Ks and sends it to the output control unit 2907, and the output control unit 2907 outputs the content.

【0192】

If the CATV terminal 107 is configured as described above, the distribution unit 2901 distributes the second EMM, transmits it to the demodulation unit 2908, and transmits it to the limited reception module 2905 via the second EMM extraction unit 2909. , Even if the tuner 2902 is receiving the frequency band of the transport stream containing the content, it is possible to receive the second EMM at any time. In addition to the demodulation unit 2903, a demodulation unit 2908 for demodulating the second EMM is provided, so an arbitrary modulation method can be adopted independently of the modulation method of the transport stream including the content. it can. For example, if the modulation method of the transport stream including the content is 64QAM, the modulation method of the second EMM can be modulated completely independently such as PSK, QPSK, FSK, and other QAMs.

【0193】

(8th Embodiment) FIG. 30 is an example of a diagram showing a main part of the internal configuration of the CATV station 105.

【0194】

The CATV station 105 transmits a second EMM to the CATV terminal through the public network 3004, and includes a communication unit 3003 for that purpose.

【0195】

The second Kw management unit 3001 of the CATV station 105 transmits the second Kw to the EMM generation unit 3002, and the second EMM generation unit 3002 generates the second EMM to the communication unit 3003. The communication unit 3003 transmits the second EMM to a transmission line different from the CATV line 106, for example, the public network 3004. Since other configurations are the same as those of the seventh embodiment, they will be diverted and described.

【0196】

FIG. 31 is an example of a diagram showing a main part of the internal configuration of the CATV terminal 107.

【0197】

This CATV terminal 107 has a communication unit 3101, and is connected to the CATV station 105 by a CATV line 106 and a public network 3004. In the CATV terminal 107, the communication unit 3101 receives the second EMM addressed to itself from the public network 3004 and transmits it to the limited reception module 3105. When the limited reception module 3105 receives the second EMM, it holds the second Kw and the contract information, and when it receives the second ECM from the separation unit 3104, it compares the holding contract information with the viewing judgment. When it is determined that the viewing is possible, the Ks contained in the second ECM is transmitted to the descrambler 3106.

【0198】

As described above, according to the present embodiment, in the CATV station 105, the communication unit 3003 sends the second EMM to the public network 3004, and in the CATV terminal 107, the communication unit 3101 is the second from the public network 3004. Since the EMM is received and sent to the conditional access module 3105, it is possible to send the second EMM at any time without affecting the transport stream containing the content on the CATV line 106. Become. Further, even if the CATV line 106 does not have a frequency band for transmitting the second EMM, the second EMM can be transmitted.

【0199】

In this embodiment, the public network 3004 is used, but the present invention is not limited to this, and various transmission means such as a dedicated line and wireless can be used.

【0200】

(9th Embodiment) FIG. 32 is an example of a diagram showing a main part of the internal configuration of the broadcasting center 101.

【0201】

This broadcasting center 101 transmits a second ECM to a CATV station by a dedicated line, and includes a communication unit 3204 for that purpose.

【0202】

This communication unit 3204 is connected to the second ECM generation unit 3202, and can further communicate with the CATV station 105 via the dedicated line 3205. The second Kw management unit 3201 transmits the second Kw to the second ECM generation unit 3202, and the simulcrypt control unit 3203 transmits the Ks received from the Ks generation unit 208 together with the first ECM generation unit 204. Send to ECM generator 3202. The second ECM generation unit 3202 generates the second ECM based on the received Ks and the second Kw and transmits the second ECM to the communication unit 3204, and the communication unit 3204 sends the second EMM to the leased line 3205. The simulcrypt control unit 3203 transmits the first ECM received from the first ECM generation unit 204 to the multiplexing unit and also transmits Ks to the scrambler 210.

【0203】

FIG. 33 is an example of a diagram showing the internal and peripheral configurations of the multiplex portion 304 in the CATV station 105. As shown in FIG. 33, the CATV station 105 has a communication unit 3303, and the communication unit 3303 is connected to the broadcasting center 101 via a dedicated line 3205. At the CATV station 105, the communication unit 3303 receives the second ECM sent from the leased line 3205 and transmits it to the common information multiplexing device 3301. The common information multiplexing device 3301 multiplexes the received second ECM to the transport stream containing the content and transmits it to the multiplexing device 3302, and the multiplexing device 3302 further multiplexes and transmits the second EMM. Other elements (not shown) are the same as those in the first embodiment, so details are omitted.

【0204】

The operation of the limited reception system configured as described above will be described below. The broadcasting center 101 transmits the content, the transport stream including the first ECM and the first EMM to the satellite line 102, and the communication unit 3204 transmits the second ECM to the leased line 3205.

【0205】

In the CATV station 105, the communication unit 3303 receives the second ECM from the leased line 3205, and the common information multiplexing device 3301 multiplexes and transmits the second ECM to the transport stream received from the satellite line 102.

【0206】

As described above, according to the present embodiment, since the second ECM that is unnecessary for the direct receiving terminal 104 does not exist on the satellite line 102, it leads to the prevention of malfunction of the direct receiving terminal 104, and further. The effect of increasing the transmission capacity on the satellite line 102 can be obtained.

【0207】

Further, FIG. 34 is a diagram illustrating the operation of the common information multiplexing device 3301, and as a method of multiplexing the second ECM, as shown in FIG. 34, the first ECM and the second ECM are interchanged. There is a method of multiplexing. The common information multiplexing device 3301 has a buffer of one or more packets, and checks the packet type while storing the transport stream in the buffer and sends them out in sequence. It also has one or more packets that hold the second ECM received from the communication unit 3303. Then, when the first ECM is detected in the transport stream when the second ECM is held, the held second ECM and the first ECM are exchanged and transmitted. In this way, it is possible to multiplex the second ECM without changing the transmission rate of the transport stream. Further, in this case, the same effect can be obtained by replacing not only the first ECM but also a null packet or the first EMM and multiplexing the second ECM.

【0208】

Further, when the first ECM is detected when the second ECM is not held, it may be replaced with a null packet. In this way, the first ECM that is unnecessary for the CATV terminal 107 is not sent to the CATV line 106, which leads to prevention of malfunction of the CATV terminal 107.

【0209】

In the present embodiment, it is necessary to share the second Kw between the second Kw management unit 3201 of the broadcasting center 101 and the second Kw management unit 307 of the CATV station 105. As a method, there is a method of using the dedicated line 3205. That is, in the broadcasting center 101, the second Kw management unit 3201 is connected to the communication unit 3204, and the second Kw is transmitted to the dedicated line 3205 via the communication unit 3204. Further, in the CATV station 105, the second Kw management unit 307 is connected to the communication unit 3303, and there is a method of receiving the second Kw from the dedicated line 3205 via the communication unit 3303. Assuming that the leased line 3205 is capable of bidirectional communication, there is also a method of transmitting the second Kw from the CATV station 105 to the broadcasting center 101 via the leased line 3205. In this case, if a plurality of CATV stations 105 are connected to the broadcasting center 101, a second Kw is transmitted from one CATV station 105 to the broadcasting center 101 via a dedicated line 3205, and the broadcasting center There is also a way for 101 to send a second Kw to another CATV station 105 via a leased line 3205. There is also a method of transmitting a second Kw from one CATV station 105 to the broadcasting center 101 and another CATV station 105 via a dedicated line 3205.

【0210】

Further, if the private key cryptosystem or the public key cryptosystem is used when transmitting the second Kw on the dedicated line 3205, the confidentiality of the second Kw can be improved.

【0211】

The second Kw sharing method is a combination of any of the methods using the leased line 3205, the storage medium described in the first embodiment, the satellite line 102, and the public network. Is possible.

【0212】

(10th Embodiment) FIG. 35 is an example of a diagram showing the overall configuration of the limited reception system.

【0213】

This system includes a first viewing history collection center 3501 that collects the viewing history of the CATV terminal 107, and a second viewing history collection center 3502. The CATV terminal 107 has a communication unit 3504 for communicating using the public network 3503, and the first viewing history collection center 3501 and the second viewing history collection center 3502 are CATV via the public network 3503. It is connected to terminal 107. Since other configurations are the same as those of the first embodiment, the operation will be described below by diverting them.

【0214】

The CATV station 105 stores and transmits the telephone number of the second viewing history collection center 3502 in the second EMM, and the CATV terminal 107 retains the telephone number. The broadcasting center 101 stores and transmits the telephone number of the first viewing history collection center 3501 in the second ECM, if necessary, according to the content. When the CATV terminal 107 has viewed the content operated by PPV, it is necessary to transmit the viewing history, but in the present embodiment, it is transmitted as shown in the flowchart shown in FIG. That is, Step 3601: Determine if the telephone number of the first viewing history collection center 3501 is stored in the second ECM corresponding to the viewed content. If you have a phone number, Step 3602: Call the first viewing history collection center 3501 to send the viewing history. Also, in step 3601, if there is no phone number, Step 3603: Call and send the viewing history using the telephone number of the second viewing history collection center 3502 that has been previously received in the second EMM.

【0215】

As described above, according to the present embodiment, the viewing history is transmitted by preferentially using the telephone number stored in the second ECM, so that the viewing history can be viewed at any place according to the content. It becomes possible to collect the history.

【0216】

In the present embodiment, the telephone number of the second viewing history collection center 3502 is stored in the second EMM and transmitted, but the CATV line 106 is capable of two-way communication, and the CATV station 105 has the viewing history. This telephone number is not particularly necessary when collecting telephone numbers, and if the telephone number is not stored, the viewing history may be transmitted using the CATV line 106 in step 3603 of FIG.

【0217】

(11th Embodiment) FIG. 37 is an example of a diagram showing an overall configuration of a limited reception system.

【0218】

The broadcasting center 3701 is connected to one or more first CATV stations 3703 that transmit the second EMM and one or more second CATV stations 3706 that transmit the Nth EMM, and the first CATV. One or more first CATV terminals 3705 are connected to station 3703 via CATV line 3704, and one or more second CATV terminals 3708 are connected to second CATV station 3706 via CATV line 3707. Has been done. The direct receiving terminal 3702 is connected to the broadcasting center 3701 via the satellite line 102.

【0219】

FIG. 38 is an example of a diagram showing a main part of the internal configuration of the broadcasting center 3701.

【0220】

The broadcasting center 3701 further has an Nth Kw management unit 3807 and an Nth ECM generation unit 3808 in the configuration of the broadcasting center 101 described in FIG. 2, and the Nth Kw management unit 3807 is the Nth N. Kw is transmitted to the Nth ECM generation unit 3808, and the simulcrypt control unit 3809 transmits Ks to the first ECM generation unit 3804, the second ECM generation unit 3806, and the Nth ECM generation unit 3808. The Nth ECM generation unit 3808 generates the Nth ECM based on the received Nth Kw and Ks and transmits it to the simulcrypt control unit 3809. The first ECM generation unit 3804 and the second ECM generation unit 3806 also generate the first ECM and the second ECM, respectively, and transmit them to the simulcrypt control unit 3809, and the simulcrypt control unit 3809 is the first ECM and the first ECM. The second ECM and the Nth ECM are transmitted to the multiplexing unit 3811, and Ks is transmitted to the scrambler 3812. Since the other components correspond to those described in the first embodiment, the description is omitted.

【0221】

FIG. 39 is a diagram showing a main part of the internal configuration of the second CATV station.

【0222】

The second CATV station 3706 has an Nth Kw management unit 3907 and an Nth EMM generation unit 3908, and the other components correspond to the elements shown in FIG.

【0223】

The Nth Kw management unit 3907 transmits the Nth Kw to the Nth EMM generation unit 3908, and the Nth EMM generation unit 3908 generates the Nth EMM based on the Nth Kw, and the multiplex unit. Send to 3904. Then, the Nth EMM is multiplexed with the transport stream containing the content and sent to the CATV line 3707.

【0224】

The internal configuration of the first CATV station is the same as the configuration described in FIG. 3, and the second EMM is generated, the second EMM is multiplexed with the transport stream containing the content, and sent to the CATV line 3704.

【0225】

The operation of the limited reception system having the above configuration will be described below.

【0226】

Broadcast center 3701 transmits the content, the first ECM, the first EMM, the second ECM and the Nth ECM to the satellite line 102, and the first CATV station 3703 sends the transport stream containing the content to the CATV line 3704. The second EMM shall be multiplexed and transmitted, and the second CATV station 3706 shall multiplex and transmit the Nth EMM to the transport stream containing the content to the CATV line 3707. The first CATV terminal 3705 uses the second ECM and the second EMM to make a viewing judgment, and the second CATV terminal 3708 uses the Nth ECM and the Nth EMM to make a viewing judgment. The direct receiving terminal 3702 makes a viewing determination using the first ECM and the first EMM.

【0227】

As described above, according to the present embodiment, the broadcasting center 3701 transmits the second ECM and the second ECM in addition to the first ECM, and the first CATV station 3703 transmits the second EMM. Since the second CATV station 3706 transmits the second EMM, each CATV station can independently perform the limited reception operation.

【0228】

In this way, multiple ECMs can be transmitted from the broadcasting center 3701, and each CATV station can perform limited reception using the ECM suitable for its own operation, making it more flexible and independent. It will be possible to operate.

【0229】

As a method of sharing each Kw, a method using a storage medium, a satellite line 102, a public network, or a dedicated line connecting the broadcasting center 3701 and the CATV station, which has been described in another embodiment, can be used. In this case, for example, when sharing the second Kw, it may be transmitted only to the CATV station using the second Kw, and the same applies to each of the other Kw. It may be transmitted only to the required CATV station.

【0230】

It should be noted that all the figures described in all the embodiments describe only the main parts, and the components that are not considered to be necessary for the present invention are omitted.

【0231】

Needless to say, all the embodiments can be used in combination as needed.

【0232】

Further, it goes without saying that there is not one transport stream to be transmitted in all the embodiments, and there are a plurality of transport streams.

【0233】

Further, the satellite line and the CATV line in all the embodiments are not particularly limited thereto, and various transmission lines such as the CATV line, the satellite line, the leased line, the radio, and the public network can be applied.

【0234】

[Effect of the invention]

As is clear from the above description, the limited reception system of the present invention has the following effects.

【0235】

The CATV station can provide the contents from the center device to the CATV terminal device with a simple configuration, can reduce the cost, and can perform the limited reception unique to the CATV station.

【0236】

Further, in a system in which the center device transmits the ECM for the CATV terminal to the CATV station by a dedicated line, the ECM unnecessary for the direct receiving terminal is removed from the satellite line, which leads to prevention of malfunction of the direct receiving terminal.

【0237】

In addition, in a system in which a CATV station repeatedly sends out the received ECM for a CATV terminal at regular intervals, it becomes possible to allocate the transmission capacity on the satellite line to the transmission of contents, etc. Effects such as higher image quality and multiple channels can be obtained.

【0238】

Further, by encrypting the ECM for the CATV terminal and the ECM for the direct receiving terminal by different encryption methods, it is possible to independently perform limited reception to the CATV terminal and the direct receiving terminal, and one of the encryption methods can be used. Even if it is broken, the effect that the other limited reception is not affected can be obtained.

【0239】

Further, by making the configuration of the access determination area of the ECM for the CATV terminal and the ECM for the direct receiving terminal separate, it becomes possible to independently perform the limited reception for the CATV terminal and the direct receiving terminal, and one of the access determination areas. Even if the configuration of is found and tampered with, the effect that the other limited reception is not affected can be obtained.

【0240】

In addition, the CATV station adds an access judgment area to the ECM for the CATV terminal and encrypts it with the third work key, which makes it possible to perform limited reception to the CATV terminal more independently and CATV. The effect of ensuring the confidentiality of the ECM for terminals can be obtained.

【0241】

In addition, the CATV station can increase the transmission capacity of information transmitted to the CATV line by removing the ECM or EMM for the receiving terminal directly from the receiving stream or replacing it with the ECM or EMM for the CATV terminal and relaying it. The effect is obtained.

【0242】

Further, by transmitting the EMM for the CATV terminal in a frequency band different from the frequency band for relaying the information including the contents, the CATV station has an arbitrary transmission capacity without affecting the transmission capacity of the information including the contents. The effect of being able to transmit EMM for CATV terminals can be obtained.

【0243】

Further, by allowing the CATV station to set the program attribute indicating the tier program or the pay-per-view program, it is possible to obtain the effect that the limited reception to the CATV terminal can be performed independently.

【0244】

Further, the system of the present invention has an effect that the work key for the CATV terminal can be easily and surely shared between the center device and the CATV station.

【0245】

In addition, the effect that the CATV station can independently change the work key for the CATV terminal can be obtained.

【0246】

In addition, the effect that the viewing history of the terminal device can be collected at an arbitrary viewing history collection destination can be obtained.

【0247】

Although the description has been made specifically for the CATV station here, the present invention can be applied to other relay devices, and the same effect can be obtained in that case as well.

[Simple explanation of drawings]

[Figure 1]

Overall configuration diagram of the limited access system according to the first embodiment of the present invention, [Figure 2]

The internal configuration diagram of the broadcasting center according to the first embodiment of the present invention, [Fig. 3]

Internal configuration diagram of the CATV station according to the first embodiment of the present invention, [Fig. 4]

The internal configuration diagram of the direct receiving terminal according to the first embodiment of the present invention, [Fig. 5]

Internal configuration diagram of the CATV terminal according to the first embodiment of the present invention, [Fig. 6]

Basic configuration diagram of EMM according to the first embodiment of the present invention, [Fig. 7]

Basic block diagram of ECM according to the first embodiment of the present invention, [Fig. 8]

The figure which shows the operation of the conditional access module in the 1st Embodiment of this invention, [Fig. 9]

Configuration diagram of the viewing determination tearbit according to the first embodiment of the present invention, [Fig. 10]

Configuration diagram of the contract information tier bit according to the first embodiment of the present invention, [Fig. 11]

Configuration diagram of the viewing determination bitmap according to the first embodiment of the present invention, [Fig. 12]

Configuration diagram of the contract information bitmap according to the first embodiment of the present invention, [Fig. 13]

Internal block diagram of the multiplex portion according to the second embodiment of the present invention, [Fig. 14]

Diagram showing the main part of the header part of the MPEG2 transport stream packet, [Fig. 15]

Basic block diagram of ECM according to the second embodiment of the present invention, [Fig. 16]

The internal configuration diagram of the multiplex portion according to the third embodiment of the present invention, [Fig. 17]

A basic configuration diagram of an EMM according to a third embodiment of the present invention, [Fig. 18]

A diagram showing the operation of the multiplexing device according to the third embodiment of the present invention. [Fig. 19]

The internal configuration diagram of the multiplex portion according to the fourth embodiment of the present invention, [Fig. 20]

The figure which shows the operation of the individual information multiplexing apparatus in 4th Embodiment of this invention. [Fig. 21]

The internal configuration diagram of the multiplex portion according to the fifth embodiment of the present invention, [Fig. 22]

The figure which shows the operation of the common information multiplexing apparatus in 5th Embodiment of this invention. [Fig. 23]

The block diagram of the second ECM according to the fifth embodiment of the present invention, [Fig. 24]

The block diagram of the second ECM according to the sixth embodiment of the present invention, [Fig. 25]

The block diagram of the second ECM according to the sixth embodiment of the present invention, [Fig. 26]

The block diagram of the second EMM according to the sixth embodiment of the present invention, [Fig. 27]

The internal configuration diagram of the CATV station according to the seventh embodiment of the present invention, [Fig. 28]

The figure which shows the frequency band on the CATV line in 7th Embodiment of this invention, [Fig. 29]

Internal configuration diagram of the CATV terminal according to the seventh embodiment of the present invention, [Fig. 30]

The internal configuration diagram of the CATV station according to the eighth embodiment of the present invention, [Fig. 31]

Internal configuration diagram of the CATV terminal according to the eighth embodiment of the present invention, [Fig. 32]

The internal configuration diagram of the broadcasting center according to the ninth embodiment of the present invention, [Fig. 33]

Configuration diagram of the inside and the periphery of the multiplex portion of the CATV station according to the ninth embodiment of the present invention, [Fig. 34]

The figure which shows the operation of the common information multiplexing apparatus in the 9th Embodiment of this invention. [Fig. 35]

Overall configuration diagram of the limited access system according to the tenth embodiment of the present invention, [Fig. 36]

The figure which shows the operation of the CATV terminal in 10th Embodiment of this invention, [Fig. 37]

Overall configuration diagram of the limited access system according to the eleventh embodiment of the present invention, [Fig. 38]

The internal configuration diagram of the broadcasting center according to the eleventh embodiment of the present invention, [Fig. 39]

Internal configuration diagram of the second CATV station in the eleventh embodiment of the present invention, [Fig. 40]

A diagram illustrating a conventional pass-through method, [Fig. 41]

It is a figure explaining the conventional simulcrypt method.

[Explanation of symbols]

101, 3701 Broadcasting Center 104, 3702 Direct receiving terminal 105 CATV station 107 CATV terminal 202, 3803 First EMM generator 204, 3804 First ECM generator 205, 3202, 3806 Second ECM generator 206, 3201, 3805 Second Kw Management Department 207, 3203, 3809 Simulcrypt control unit 303, 2703, 3903 PSI converter 304, 3904 Multiple parts 305, 2704, 3905 QAM modulator 306, 2705, 3906 Frequency converter 307, 2706, 3001 Second Kw Management Department 308, 2707, 3002 Second EMM generator 404, 504, 2904, 3104 Separator 405, 505, 2905, 3105 Limited Access Module 1301 Common information removal device 1302, 1602, 2102, 3302 Multiplexing device 1501 ECM identifier 1601 Individual information removal device 1701 EMM identifier 1901 Individual information multiplexing device 2101, 3301 Common information multiplexing device 2301 Program attributes 2710 Modulator 2708 Frequency converter 2901 Distribution section 2909 Second EMM extractor 3003 Communication Department 3101 Communication Department 3204 Communication Department 3303 Communication Department 3501 First viewing history collection center 3502 Second viewing history collection center 3703 First CATV station 3705 First CATV terminal 3706 Second CATV station 3708 Second CATV terminal 3907 Nth Kw Management Department 3908 Nth EMM generator