Content recording method, content recording system, and recording/reproducing apparatus

The present invention relates to recording the content distributed from the broadcasting station side, and confirming the MOVE operation and erasing the content when the recorded content is MOVE-processed.

In recent years, a copyright protection function has been added to content in order to protect the copyright of content such as video and audio programs, data programs, and data broadcasting data distributed from broadcasting stations. When MOVE processing the content protected by this copyright protection function, the recorded content is transmitted to another recording device according to the rules stipulated in the copyright protection function and deleted after a predetermined time has elapsed. This allows transmission recording to other recording devices. This MOVE process is a content transfer process for Copy Once content (content that is allowed to be recorded only once). This Copy Once content is only allowed to be recorded once and is not allowed to be copied to another recording medium, but after recording this Copy Once content on a recording medium of a recording device, for example. , It is permitted to record the recorded content on the recording medium of another recording device on condition that the recorded content is deleted.

For example, a copy once content recorded by a recording / playback device (hereinafter referred to as a transmitting side recording / playback device) having a hard disk (HDD) for recording the copy once content distributed from the broadcasting station side as a recording medium can be, for example, a DVD. -Copy Once content recorded on the transmitting side recording / playback device transmitted to the receiving side recording / playback device by transmitting and recording to a recording / playback device (hereinafter referred to as the receiving side recording / playback device) using RAM as a recording medium. In the MOVE process to be erased, even if the power of the receiving side recording / playback device that records the Copy Once content transmitted from the transmitting side recording / playback device is turned off, the transmitting side recording / playback device continues the transmission operation. The Copy Once content recorded on the transmitting recording / playback device is deleted after a predetermined time has elapsed. However, the receiving-side recording / playback device that receives and records the Copy Once content cannot record the Copy Once content transmitted from the transmitting-side recording / playback device because the power is turned off.

In this way, when the power of either the transmitting side recording / playback device or the receiving side recording / playback device is turned off, for example, as proposed in Patent Document 1, the power off operation is detected. EOB (End of bit) is added to the end of the playback stream from the receiving side recording / playback device and output to the receiving side recording / playback device, and the receiving side recording / playback device records up to the data to which the EOB is added. After confirmation, the power is turned off.<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2002-300517.</text></patcit>

<p> According to Patent Document 1, when the power of either the transmitting side recording / playback device or the receiving side recording / playback device is turned off in the MOVE process of Copy Once content, the power off operation is detected and the transmitting side is detected. By adding EOB to the transmission content from the recording / playback device, the content up to the end of the stream to which the EOB is added is recorded by the receiving side recording / playback device, and the transmitting side recording / playback device is after the EOB is added. By continuously recording and retaining the untransmitted content of the stream, it is protected from accidental content erasure of the transmitting side recording / playback device due to the power being turned off during MOVE processing.</p><p> The recording / playback device proposed in Patent Document 1 is protected from unnecessary erasure of contents when the power is turned off. However, for example, the receiving side recording / playback device is a transmitting side recording / playback device due to a factor other than the power off operation. Even if the content transmitted from is not normally recorded, the transmitting side recording / playback device is erased after a predetermined time of the transmitted content has elapsed.</p><p> For this reason, when the transmitting side recording / playback device is set to the operating state of the MOVE process, the transmitted content erasing operation is executed regardless of the reception / recording state of the content of the receiving side recording / playback device, and the transmitting side recording / playback device and the receiving side are executed. Content is not recorded on any of the recording / playback devices.</p><p> The present invention has been made in view of such circumstances, and is a content recording that controls the erasing operation and the transmission operation of the recorded content of the transmitting side recording / playback device according to the reception / recording state of the content of the receiving side recording / playback device. The purpose is to provide a system.</p>

<p> In the content recording method of the present invention, a transmitting side recording / playback device that records received content on a transmitting side recording medium and transmits the reproduced content that reproduces the content, and a playback content transmitted from the transmitting side recording / playback device are recorded. A content recording method comprising a receiving-side recording / playback device that receives and records the reproduced content on a receiving-side recording / playback device, wherein the receiving-side recording / playback device is the playback content transmitted from the transmitting-side recording / playback device. The recording status information on the receiving-side recording medium is generated and returned to the transmitting-side recording / playback device, and the transmitting-side recording / playback device is based on the recording status information of the playback content returned from the receiving-side recording / playback device. The feature is that the transmitted content recorded on the transmitting side recording medium is erased.</p><p> When recording the received content on the transmitting side recording medium, the transmitting side recording / playback device of the content recording method of the present invention adds predetermined frame identification information as an identification information signal and records the content, and includes the identification information signal. It is characterized in that the reproduced content is output to the receiving side reproduction recording device.</p><p> The recording state information of the reproduced content generated and returned by the receiving side recording / reproducing device of the content recording method of the present invention on the receiving side recording medium is used as a video signal of the reproduced content transmitted from the transmitting side recording / reproducing device and the reproduced content. It has either the assigned identification information signal or the recording operation signal of the playback content of the receiving side recording / playback device, and the recording status information of the playback content returned from the receiving side recording / playback device is played back. In the case of the video signal of the content, the match between the video signal of the playback content returned from the receiving side recording / playback device and the video signal of the transmitted playback content is confirmed, and the playback content returned from the receiving side recording / playback device is confirmed. When the recording state information is a video signal of the playback content, an identification information signal included in the video signal of the playback content returned from the receiving side recording / playback device is extracted, and the extracted identification information signal and the transmitted playback content When the matching of the identification information signal is confirmed, or when the recording state information of the playback content returned from the receiving side recording / playback device is the identification information signal of the playback content, the playback content returned from the receiving side recording / playback device The matching of the identification information signal and the identification information signal of the video signal of the transmitted playback content is confirmed, and the transmitted content recorded on the transmitting side recording medium of the transmitting side recording / playback device up to the time when the matching is confirmed is confirmed. Erase. Alternatively, when the recording status information of the playback content returned from the receiving-side recording / playback device is a recording operation signal of the playback content of the receiving-side recording / playback device, the recording operation signal of the playback content returned from the receiving-side playback / recording device. It is characterized in that the transmitted reproduced content recorded on the transmitting side recording medium up to the time indicating that the reproduced content is correctly recorded in the receiving side reproduction recording device is erased.</p><p> The transmitting side recording / playback device of the content recording method of the present invention temporarily stores the identification information given to the content when playing back and transmitting the content recorded on the transmitting side recording medium, and the receiving side recording / playback device. It is characterized in that it is compared with the identification information signal included in the recording state information from.</p><p> The content recording system of the present invention records the received content on the transmitting side recording medium, reproduces the content, transmits the reproduced content, and transmits the transmitting side recording / reproducing device and the reproduced content transmitted from the transmitting side recording / reproducing device. A content recording system consisting of a receiving-side recording / playback device that receives and records the reproduced content on the receiving-side recording medium, and a video recording means that adds identification information to the received content and records it on the transmitting-side recording medium. A video reading means that reads the content to which the identification information recorded on the transmitting side recording medium is added and transmits it as playback content to the receiving side recording / playback device, and the receiving side recording / playback device that reads the content by the video reading means. The identification information reading means for extracting and temporarily recording the identification information given to the playback content transmitted to the receiver and the recording status information of the playback content on the reception-side recording medium from the reception-side recording / playback device are received. It has a video erasing means for confirming the match between the recording state information and the identification information temporarily recorded in the identification information reading means and erasing the contents recorded on the transmitting side recording medium up to the time when the match is confirmed. The transmitting side recording / playback device, the video recording means for recording the reproduced content including the identification information transmitted from the transmitting side recording / playback device on the receiving side recording medium, and the video recording means for recording on the receiving side recording medium. A video reading means that reads out the reproduced content and generates the recording state information of the read reproduced content, and a video transmitting means that transmits the recording state information of the reproduced content generated by the video reading means to the transmitting side recording / playback device. It is characterized by including a receiving side recording / playback device having the above.</p><p> The recording / playback device of the present invention has a video recording unit that adds identification information to the received content and records it on the transmitting side recording medium, reads and reproduces the content recorded on the recording medium, and reads and reproduces the reproduced content. The playback content is normal in the receiving-side recording / playback device based on the video reading unit to be transmitted to the receiving-side recording / playback device and the recording status information of the playback content returned from the receiving-side recording / playback device on the receiving-side recording / playback medium. Until the time when it is confirmed that the playback content transmitted from the video reading unit is normally recorded in the receiving side recording / playback device in the recording status confirmation unit for confirming whether the content is recorded in the video reading unit and the recording status confirmation unit. It is characterized by including a video erasing unit for erasing the content read and reproduced from the transmitting side recording medium.</p><p> In the video recording unit of the recording / reproducing device of the present invention, the identification information given to the content is characterized by being frame identification information provided in a predetermined frame unit of the content.</p><p> The recording state confirmation unit of the recording / playback device of the present invention is the identification information given to the playback content included in the recording state information returned from the receiving side recording / playback device, or the recording operation state of the receiving side recording / playback device. It is characterized in that the recording state of the reproduced content in the receiving-side recording / reproducing device is confirmed by using any of the signals.</p>

<p> The content recording method, content recording system, and recording / playback device of the present invention control the playback / transmission operation of the transmitting side recording / playback device according to the content recording state of the receiving side recording / playback device based on the copyright protection function. It is possible to protect the contents recorded in the transmitting recording / playback device from unnecessary erasure, and the MOVE process can be surely executed based on the copyright protection function.</p>

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the outline of the MOVE process of the Copy Once content will be described with reference to FIGS. 12 to 13. As shown in FIG. 14, the copyright protection information given to the content is Copy Free content, and the content with the flag "00" can be freely copied. Content with the flag "10" is Copy Once content and is allowed to be copied only once. When this Copy Once content is copied to a recording medium, the copyright protection information is rewritten to the flag "01" No More Copies, and further copying is prohibited. The content with the flag "11" is Copy Never content, and copying is prohibited.

Copy Free content with the flag "00" of the content having the copyright protection information can be freely recorded on the recording medium by the recording / playback device. Copy Never content with flag "11" is prohibited from being recorded on recording media on any recording / playback device. Further, as shown in FIG. 13, the Copy Once content of the flag 10 can be copied once by the recording / playback device by rewriting the received Copy Once content to No More Copies of the flag 01. When this flag "01" Copy Once content is transmitted from the recording / playback device that recorded the content to another recording / playback device and copied to other recording media, the flag "01" No More Copies content is flagged as "10" Copy Once content. It is possible to perform MOVE processing that erases the content recorded in the original recording device within 1 minute from the transmission while returning to.

Among the contents to which the copyright protection information is attached, the content recording system of the present invention that performs a MOVE process of transmitting and recording the Copy Once content from the recording medium to another recording medium is shown in FIG. As described above, the transmitting side recording / playback device (transmission / playback side in the figure) that receives the Copy Once content and records it on the recording medium, and reproduces the Copy Once content recorded on the recording medium and transmits it to another recording / playback device. Displayed as a device, hereinafter referred to as a transmission / playback device) 10, and a reception-side recording / playback device (reception / recording side in the figure) that receives the Copy Once content that is reproduced and transmitted from the transmission / playback device 10 and records it on a recording medium. It is displayed as a device and is hereinafter referred to as a reception / recording side device) 30 and is transmitted based on the recording status information returned from the reception / recording side device 30 for the Copy Once content transmitted from the transmission / playback side device 10. The playback device 10 erases the transmitted Copy Once content.

The configuration of the transmission / playback side device 10 of this content recording system will be described with reference to FIG. The transmission / playback side device 10 includes a video recording unit 11, a frame identification information adding unit 12, a transmitting side recording medium 13, a video reading unit 14, a video transmitting unit 15, a frame identification information reading unit 16, a recording state receiving unit 17, and a frame. It consists of an identification information receiving unit 18, a recording status confirmation unit 19, and a video erasing unit 20.

The video recording unit 11 receives the Copy Once content of the copyright protection information flag 10 delivered from the broadcasting station side, performs predetermined signal processing on the content, and converts it into the flag 01 No More Copies content. It is converted and recorded on the transmitting side recording medium 13.

The frame identification information assigning unit 12 assigns an identification number to each video frame of the content when a predetermined signal processing is performed in the video recording unit 11, and the content to which the video frame identification number is assigned is assigned. It is recorded on the transmitting side recording medium 13. The transmitting side recording medium 13 is a recording medium that can be erased at the same time as writing / recording such as HDD and DVD-RAM and reading / playing.

The video reading unit 14 replays and reads the flag 01 No More Copies content to which the identification number for each video frame recorded on the transmitting side recording medium 13 is assigned, and the video transmitting unit 15 and the frame identification information reading unit 16 Output to. The video transmission unit 15 converts the flag 01 No More Copies content including the video frame identification number from the video reading unit 14 into the flag 10 Copy Once content and transmits the content to the reception / recording side device 30. The video transmission unit 15 is connected to the video reception unit 31 described later of the reception recording side device 30 by using a transmission line such as IEEE1394.

The frame identification information reading unit 16 extracts a video frame identification number from the content including the video frame identification number from the video reading unit 14, and temporarily stores the extracted video frame identification number.

The recording state receiving unit 17 receives the recording state information of the content from the video transmitting unit 35, which will be described later, of the receiving / recording side device 30 to the receiving side recording medium 33. A transmission line such as IEEE1394 is provided between the recording state receiving unit 17 and the receiving recording side device 30.

The frame identification information receiving unit 18 extracts, for example, a video frame identification number from the recording state information of the content received from the reception / recording side device 30 received by the recording state receiving unit 17.

The recording state confirmation unit 19 includes the video frame identification number of the content transmitted from the video transmission unit 15 temporarily stored in the frame identification information reading unit 16 and the frame identification information receiving unit 18 received by the recording state receiving unit 17. By comparing with the video frame identification number extracted in the above, it is confirmed whether the video frame identification number of the content transmitted from the transmission / playback side device 10 and the video frame identification number of the content received / recorded by the reception / recording side device 30 match. To do.

The video erasing unit 20 confirms that the video frame identification number of the content transmitted from the transmission / playback side device 10 from the recording state confirmation unit 19 matches the video frame identification number of the content received and recorded by the reception / recording side device 30. Of the video frames of the content written and recorded on the transmitting side recording medium 13, the video frames of the content whose reception recording by the reception recording side device 30 has been confirmed are deleted.

Next, the configuration of the reception recording side device 30 will be described with reference to FIG. Recording state reception of video receiving unit 31, video recording unit 32, receiving side recording media 33, video reading unit 34, and transmission / playback side device 10 connected to the video transmitting unit 15 of the transmitting / reproducing side device 10 by an IEEE1394 transmission line. It consists of a unit 17 and a video transmission unit 35 connected to an IEEE1394 transmission line.

The video receiving unit 31 receives the flag 10 Copy Once content including the video frame identification number transmitted from the video transmitting unit 15 of the transmission / playback side device 10, and performs processing such as amplification processing and noise removal. Output to the video recording unit 32.

The video recording unit 32 performs predetermined signal processing on the flag 10 Copy Once content including the video frame identification number from the video receiving unit 31 and converts it into the flag 01 No More Copies content on the receiving side recording medium. Have 33 record. The receiving side recording medium 33 is a recording medium such as an HDD, a DVD-RAM, and a digital recording magnetic tape.

The video reading unit 34 reads the flag 01 No More Copies content recorded on the receiving side recording medium 33 and outputs the content to the video transmitting unit 35.

The video transmission unit 35 returns the flag 01 No More Copies content read by the video reading unit 34 to the recording state receiving unit 17 of the transmitting / reproducing side device 10 as the recording state information of the receiving / recording side device 30.

The reception / recording side device 30 includes a command receiving unit 36 and a response unit 37 for transmitting the recording status information by the transmission request command of the recording status information of the receiving / recording side device 30 from the transmission / playback side device 10. It may be provided.

Further, the command receiving unit 36 drives the video reading unit 34 based on a request command from the transmitting / reproducing side device 10 described later, and the video of the reproduced content recorded on the receiving side recording medium 33 of the receiving / recording side device 30. Recording state information such as the above-mentioned identification information signal of the video frame identification number given to the signal and the playback content, or the recording operation signal indicating the recording operation of the reception / recording side device 30 is generated and transmitted / reproduced from the response unit 37. Have them reply to the side device 10.

The MOVE process of the Copy Once content between the transmission / playback side device 10 and the reception / recording side device 30 having such a configuration will be described with reference to FIGS. 3 to 5. First, with reference to FIG. 3, the MOVE processing operation by the video signal of the content by the content recording system of the first embodiment of the present invention will be described. In the first embodiment, the transmission / playback side device 10 uses an HDD, DVD-RAM, or the like as a recording medium capable of both reading and playing back the recorded data and erasing the read and played back data. It is a playback device, and the reception / recording side device 30 is a recording / playback device capable of so-called chase playback, which uses a data recording and an HDD or DVD-RAM that can read and play the recorded data as a recording medium. ..

The Copy Once content distributed from the broadcasting station side is a video frame identification number by the video recording unit 11 and the frame identification information giving unit 12 of the transmission / playback side device 10, for example, the identification information A, B, C, D ,. .. is added, and it is converted into No More Copies content and recorded on the transmitting side recording medium 13.

The method of assigning the video frame identification information to the Copy Once content in the video recording unit 11 and the frame identification information adding unit 12 is CRC (Cyclic Redundancy) shown in ANSI FDDI Media Access Control (ANSI FDDI Media Access Control). Use Chech) or random values.

When the No More Copies content to which the identification information A, B, C, D, ... Recorded on the transmission side recording medium 13 of the transmission / playback side device 10 is added is transmitted to the reception / recording side device 30 for recording. , The video reading unit 14 of the transmission / playback side device 10 reads out the No More Copies content including the identification information A, B, C, D, ... Recorded on the transmitting side recording medium 13, and displays the read content as a video. The transmission unit 15 converts the content into Copy Once content and transmits it to the reception / recording side device 30, and the frame identification information reading unit 16 extracts the identification information of the content to be transmitted to the reception / recording side device 30, for example, transmission. The identification information A and B of the completed content are extracted and temporarily stored.

The reception / recording side device 30 receives the Copy Once content to which the identification information A and B transmitted from the transmission / playback side device 10 are added by the video receiving unit 31, and converts it into No More Copies content by the video recording unit 32. It is re-recorded on the receiving side recording medium 33 together with the identification information A and B. The content including the identification information A and B re-recorded on the receiving side recording medium 33 is read by the video reading unit 34 and re-recorded content as recording state information from the video transmitting unit 35 to the transmitting / reproducing side device 10. Reply the video signal of.

The video signal of the re-recorded content of the identification information A and B returned from the reception / recording side device 30 is received by the recording state receiving unit 17 of the transmission / playback side device 10, and from the received re-recorded content video signal. Identification information A and B are extracted by the frame identification information receiving unit 18. The recording status confirmation unit 19 compares whether the identification information A and B extracted by the frame identification information receiving unit 18 and the identification information A and B of the transmitted content temporarily stored in the frame identification information reading unit 16 match. Make a confirmation. In the recording state confirmation unit 19, the identification information A and B of the content transmitted from the transmission / playback side device 10 to the reception / recording side device 30 and the identification information A and B of the re-recorded content received and recorded by the reception / recording side device 30. When they match, the video erasing unit 20 erases up to the video frame having the identification information A and B among the contents recorded on the transmitting side recording medium 13.

As a result, it is possible to perform a MOVE process in which the copy once content recorded in the transmission / playback side device 10 is transmitted to the reception / playback side device 30 to be re-recorded, and the content recorded in the transmission / playback side device 10 is erased. ..

If the recording status confirmation unit 19 of the transmission / playback side device 10 determines that the identification information of the transmitted content and the identification information of the re-recorded content from the reception / playback side device 30 do not match, the reception / playback side device At 30, it is determined that the content transmitted from the transmission / playback side device 10 has not been re-recorded normally, and the video erasing unit 20 stops the erasing operation of the content recorded on the transmitting side recording medium 13. The transmission / playback operation is also stopped. As a result, the transmission / playback side device 10 can delete the content after confirming that the transmitted content is normally recorded in the reception / recording side device 30.

Next, the operation of the MOVE process using the content identification information signal by the content recording system of the second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the transmission / playback side device 10 uses an HDD, DVD-RAM, or the like as a recording medium capable of both reading and playing back the recorded data and erasing the read and played back data. It is a playback device, and the reception / recording side device 30 is a recording / playback device capable of so-called chase playback, which uses a data recording and an HDD or DVD-RAM that can read and play the recorded data as a recording medium. ..

The transmission / playback side device 10 has a video frame identification number, for example, identification information A, B, C, D, ... Is added, and the content is converted into No More Copies content and recorded on the transmitting side recording medium 13. When the content to which the identification information A, B, C, D, ... Recorded on the transmitting side recording medium 13 is added is transmitted to the receiving / recording side device 30 for recording, the video of the transmitting / reproducing side device 10 is read. The No More Copies content including the identification information A, B, C, D, ... Recorded on the transmitting side recording medium 13 is read by the unit 14, and the read content is converted into the Copy Once content by the video transmitting unit 15. The content identification information that is converted and transmitted to the reception / recording side device 30 and transmitted to the reception / recording side device 30 is extracted by the frame identification information reading unit 16, and the identification information A and B of the transmitted content are extracted, for example. Extract and temporarily store.

The reception / recording side device 30 receives the Copy Once content to which the identification information A and B transmitted from the transmission / playback side device 10 are added by the video receiving unit 31, and converts it into No More Copies content by the video recording unit 32. It is re-recorded on the receiving side recording medium 33 together with the identification information A and B.

The transmission / playback side device 10 transmits the content to which the identification information A and B are added to the reception / recording side device 30, and also transmits a frame identification information transmission request command. The frame identification information transmission request command from the transmission / playback side device 10 is received by the command reception unit 36 of the reception / recording side device 30. In accordance with this frame identification information transmission request command, the command receiving unit 36 drives the video reading unit 34 to read the content re-recorded on the receiving side recording medium 33, and reads the identification information A and B attached to the content. It is extracted and output to the response unit 37. The response unit 37 generates a frame identification information reply command, which is an identification information signal, based on the identification information A and B read and extracted by the video reading unit 34, and returns the command to the transmission / playback side device 10.

The frame identification information reply command returned from the reception / recording side device 30 is received by the recording status reception unit 17 of the transmission / playback side device 30, and is re-recorded by the frame identification information reception unit 18 from the received frame identification information reply command. Extract the identification information A and B of the completed content. It is recorded whether the identification information A and B extracted by the recording state receiving unit 17 and the frame identification information receiving unit 18 and the identification information A and B of the transmitted content temporarily stored in the frame identification information reading unit 16 match. The status confirmation unit 19 performs a comparison check, and the identification information A and B of the content transmitted from the transmission / playback side device 10 to the reception / recording side device 30 and the identification information A and B of the content re-recorded by the reception / recording side device 30 are displayed. If they match, the video erasing unit 20 erases the contents up to the frame having the identification information A and B among the contents recorded on the transmitting side recording medium 13.

As a result, it is possible to perform a MOVE process in which the copy once content recorded in the transmission / playback side device 10 is transmitted to the reception / playback side device 30 to be re-recorded, and the content recorded in the transmission / playback side device 10 is erased. ..

If the recording status confirmation unit 19 of the transmission / playback side device 10 determines that the identification information of the transmitted content and the identification information of the re-recorded content from the reception / playback side device 30 do not match, the reception / playback side device At 30, it is determined that the content transmitted from the transmission / playback side device 10 has not been re-recorded normally, and the video erasing unit 20 stops the erasing operation of the content recorded on the transmitting side recording medium 13. The transmission / playback operation is also stopped. As a result, the transmission / playback side device 10 can delete the content after confirming that the transmitted content is normally recorded in the reception / recording side device 30.

Next, the MOVE processing operation using the recording operation signal by the content recording system according to the third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the transmission / playback side device 10 uses an HDD, DVD-RAM, or the like as a recording medium capable of both reading and playing back the recorded data and erasing the read and played back data. The reception / recording side device 30 is a playback device, and the reception / recording side device 30 is a recording / playback device capable of so-called chase playback, which uses a data recording and an HDD capable of reading and playing back the recorded data, or a DVD-RAM or the like as a recording medium. , A digital video device using a magnetic tape capable of digitally recording the content transmitted from the transmission / playback device 10 as a recording medium.

The transmission / playback side device 10 has a video frame identification number for the Copy Once content distributed from the broadcasting station side, for example, identification information A, B, C, D, .. Is added, and it is converted into No More Copies content and recorded on the transmitting side recording medium 13. When transmitting the No More Copies content to which the identification information A, B, C, D, ... Recorded on the transmitting side recording medium 13 is added to the receiving recording side device 30 for recording, the transmitting / reproducing side device 10 No More Copies content including identification information A, B, C, D, ... Recorded on the transmitting side recording medium 13 is read by the video reading unit 14 of the above, and the read content is copied by the video transmitting unit 15. Once converted to content and transmitted to the reception / recording side device 30.

The reception / recording side device 30 receives the Copy Once content to which the identification information A and B transmitted from the transmission / playback side device 10 are added by the video receiving unit 31, and converts it into No More Copies content by the video recording unit 32. It is re-recorded on the receiving side recording medium 33 together with the identification information A and B.

The transmission / playback side device 10 transmits the content to which the frame identification information is added to the reception / recording side device 30, and also transmits a request command for the recording operation signal. The recording operation signal request command from the transmission / playback side device 10 is received by the command receiving unit 36 of the reception / recording side device 30. In accordance with this recording operation signal request command, the command receiving unit 36 drives the video reading unit 34 to determine whether the content re-recording operation on the receiving side recording medium 33 is normally performed, and determines the determination result as the response unit. Output to 37. The response unit 37 converts the recording operation signal into a reply command and returns it to the transmission / playback side device 10 according to the determination result of the video reading unit 34.

The recording operation signal reply command returned from the reception / recording side device 30 is received by the recording state receiving unit 17 of the transmission / playback side device 10, and the received recording operation signal reply command is a normal replay of the reception / recording side device 30. When the command indicates a recording operation, the video erasing unit 20 erases the contents of the identification information A and B transmitted from the transmitting / reproducing device 10 to the receiving / recording device 30 from the transmitting recording medium 13.

As a result, it is possible to perform a MOVE process in which the copy once content recorded in the transmission / playback side device 10 is transmitted to the reception / playback side device 30 to be re-recorded, and the content recorded in the transmission / playback side device 10 is erased. ..

If the recording status confirmation unit 19 of the transmission / playback side device 10 recognizes that the reception / recording side device 30 is not normally performing the content recording operation by the recording operation signal reply command from the reception / recording side device 30. Then, the erasing operation of the content recorded on the transmitting side recording medium 13 by the video erasing unit 20 is stopped, and the transmission / playback operation is also stopped.

As a result, the transmission / playback side device 10 can delete the content after confirming that the transmitted content is normally recorded in the reception / recording side device 30.

FIG. 6 shows a recording method and a transmission method of the identification information given to the video frame of the content in the MOVE process described with reference to FIGS. 3 to 5. The method of recording and transmitting the identification information is the transmission and recording state confirmation by the video signal of the first embodiment of the present invention described with reference to FIG. 3, and the second method of the present invention described with reference to FIG. It is used for transmission by the identification information signal of the embodiment.

The method shown in FIG. 6 records the identification information in the format of DTCP_descriptor included in MPEG2-TS. The identification information is recorded in the area called private_data_byte in DTCP_Drescriptor. In this private_data_byte area, it is recorded in a 24-bit area called Frame_Identifier. The recording method is uimsbf (Unsigned Interger Most Significant Bit First: an unsigned integer with the most significant bit first). The identification information is transmitted and received in the transmission line in this format. The method for recording the identification information may be a method other than the above-mentioned method, and the present invention is not limited to the above-mentioned recording method.

Further, as a method for confirming the recording state of the second embodiment of the present invention described with reference to FIG. 4, there are the methods shown in FIGS. 7 and 8. The transmission / playback side device 10 transmits an identification information request command to the reception / recording side device 30 in the format shown in FIG. The reception / recording side device 30 returns a recording status reply command to the transmission / playback side device 10 in the format shown in FIG. The request interval of the identification information from the transmission / playback side device 10 may be a method of requesting and responding to each video frame, or a method of collectively requesting at the start of video transmission and receiving only the response during video transmission. Conceivable.

Further, as a recording operation confirmation method of the third embodiment of the present invention described with reference to FIG. 5, there are the methods shown in FIGS. 9 and 10. The transmission / playback side device 10 transmits a recording operation request command of the reception / recording side device 30 in the format shown in FIG. The reception / recording side device 30 returns a recording operation reply command to the transmission / playback side device 10 in the format shown in FIG. In addition, in FIG. 10, it is found that the reception recording side device 30 is in the normal recording state (RECODE FORWARD). As the recording operation confirmation method, in addition to the above-mentioned format, a plurality of other formats for confirming the recording state of the reception / recording side device 30 can be considered, and the recording operation confirmation method is not limited to the above-mentioned format.

Next, the operation of erasing the content transmitted to the reception / recording side device 30 from the addition of the video frame identification information to the content of the transmission / playback side device 10 will be described with reference to the flowchart of FIG.

The transmission / playback side device 10 generates the video frame identification number, which is the video frame identification information, in the frame identification information addition unit 12 (step S1). The video frame identification number generated by the frame identification information assigning unit 12 is assigned to each video frame of the received content in the video recording unit 11 (step S2). In the video recording unit 11, the content to which the video frame identification number is assigned for each video frame is recorded on the transmitting side recording medium 13 (step S3).

In this way, when the content with the video frame identification number recorded on the transmitting side recording medium 13 is read out and re-recorded on the receiving side recording medium 33 of the receiving recording side device 30, the transmitting / reproducing side device The video reading unit 14 of 10 reads the content to which the video frame identification number recorded on the transmitting side recording medium 13 is assigned (step S4). The content to which the video frame identification number read from the transmitting side recording medium 13 by the video reading unit 14 is assigned is transmitted from the video transmitting unit 15 to the receiving recording side device 30, and the video frame identification number is temporarily stored ( Step S5).

Next, the recording state receiving unit 17 of the transmitting / reproducing side device 10 receives the recording information returned from the receiving / recording side device 30 (step S6). As a method of transmitting / receiving the recording state information from the reception / recording side device 30 in the recording state receiving unit 17, any of the methods shown in FIGS. 6, 8 and 10 is used. It is confirmed whether the video frame identification information can be extracted by the frame identification information receiving unit 18 from the recording information received by the recording state receiving unit 17 (step S7). Whether or not the video frame identification information can be extracted by the frame identification information receiving unit 18 can be determined by extracting the video frame identification number shown in FIGS. 6 and 8 and the frame identification information when the identification information reply command is returned. When the recording status reply command shown in 10 is returned, it is determined that the frame identification information cannot be extracted.

When the frame identification information receiving unit 18 confirms that the video frame identification information can be extracted, the video frame identification information is extracted (step S8). Using the video frame identification information extracted in step S8 and the recording status reply command that does not include the video frame identification information determined in step S7, it is determined whether the reception / recording side device 30 is normally recording (step). S9).

If it is determined in step S7 that the normal recording determination of the reception recording side device 30 in step 9 is a recording state reply command in which identification information cannot be extracted, the reception recording side device 30 normally records from the recording state reply command. Judge whether it is in the operating state of. If it is determined in step S7 that the identification information can be extracted, the frame identification information extracted in step S8 and the frame identification information reading unit 16 extract and temporarily store the frame identification information when the video is transmitted in step S5. When the identification information matches with the transmitted frame identification information, it is determined that the transmission content is normally re-recorded in the reception recording side device 30.

In step S9, when it is confirmed that the reception / recording side device 30 is in the normal recording operation state, the recording state confirmation unit 16 drives the video erasing unit 20 to record on the transmission side recording medium 13. Delete the video frame for which the matching of the frame identification information is confirmed, or the video frame transmitted by the time when the normal recording operation is confirmed (step S10).

After erasing the video frame in step S10, the video reading unit 14 determines whether the erasing process of all the video frames of the content recorded on the transmitting side recording medium 13 is completed (step S11). As a result of the determination in step S11, if it is determined that the transmitting side recording medium 13 has an unerased video frame, the process returns to step S6 and the reception determination process of the next recorded information is performed. As a result of the determination in step S11, when it is confirmed that all the video frames of the transmission side recording medium 13 have been erased, the transmission of the content from the transmission / playback side device 10 is stopped (step S12).

Further, in step S9, when it is determined from the recording information from the reception / recording side device 30 that the reception / recording side device 30 is not normally recording, the content transmission operation of the transmission / playback side device 10 is stopped (step S12). ).

As described above, in the present invention, the recording state of the receiving / recording side device can be confirmed by the recording state checking unit provided in the transmitting / playing side device, and the contents of the transmitting / reproducing side device can be erased. It is possible to prevent the content from being erased when the MOVE process is unsuccessful due to some kind of recording operation malfunction, and when the receiving / recording side device normally receives and records the content, it is recorded in the transmitting / playing side device. You can surely erase the existing contents.

<figref num="1">The block diagram which shows the structure of the transmission play side apparatus used for the content recording system which concerns on this invention.</figref><figref num="2">The block diagram which shows the structure of the reception recording side apparatus used for the content recording system which concerns on this invention.</figref><figref num="3">FIG. 3 is a block diagram illustrating a MOVE processing operation between a transmission / playback side device and a reception / recording side device using a video signal of content by the content recording system of the first embodiment of the present invention.</figref><figref num="4">FIG. 3 is a block diagram illustrating a MOVE processing operation between a transmission / playback side device and a reception / recording side device using a content identification information signal by the content recording system of the second embodiment of the present invention.</figref><figref num="5">FIG. 3 is a block diagram illustrating a MOVE processing operation between a transmission / playback side device and a reception / recording side device using a content recording operation signal by the content recording system according to the third embodiment of the present invention.</figref><figref num="6">The explanatory view explaining the recording and transmission format of the identification information between the transmission play side apparatus and the reception recording side apparatus by the content recording system of this invention.</figref><figref num="7">An explanatory diagram illustrating a format of an identification information request command from a transmission / playback side device to a reception / recording side device by the content recording system of the present invention.</figref><figref num="8">The explanatory view explaining the format of the identification information return command from the reception recording side apparatus to the transmission reproduction side apparatus by the content recording system of this invention.</figref><figref num="9">The explanatory view explaining the format of the recording information request command from the transmission / playback side device to the reception / recording side device by the content recording system of the present invention.</figref><figref num="10">The explanatory view explaining the format of the recording information return command from the reception recording side device to the transmission / playback side device by the content recording system of the present invention.</figref><figref num="11">The flowchart explaining the MOVE processing operation between the transmission / playback side device and the reception / recording side device by the content recording system of the present invention.</figref><figref num="12">The explanatory view explaining the MOVE process of the content recording system which concerns on this invention.</figref><figref num="13">Explanatory drawing explaining the recording and erasing of the copy once content of the content of this invention.</figref><figref num="14">Explanatory drawing explaining copyright protection information set in the content which concerns on this invention.</figref>

Code description

10 Transmission side recording / playback device (transmission / playback side device), 11 video recording unit, 12 frame identification information addition unit, 13 transmission side recording media, 14 video reading unit, 15 video transmission unit, 16 frame identification information reading unit, 17 recording Status receiver, 18-frame identification information receiver, 19 recording status confirmation unit, 20 video eraser, 30 receiver recording / playback device (reception / recording device), 31 video receiver, 32 video recording section, 33 receiver recording media , 34 video reader, 35 video transmitter, 36 command receiver, 37 response. Attorney Susumu Ito