Machine readable optical disc with reading-inhibit agent

A comprises a machine is capable of reading the information encoding the (22) disc (20) is adhere component is floater on disc the detecting. The detecting (24) is used for preventing machine reading to say the. Comprises a bear card reading the medicine and disc (14,34), and a enduring reading agent is made of according to say the detecting activation, and a plurality of time and activation, the linear disc to forbid reading state. , Or a cancel the detecting, using primary reading disc for determining is connected with the medicine preparation instrument, for example disc dew of the optical disc's the radiation, or rotating disc.