| 摘要 |
<p>A system for accessing media data stored in a recording medium has a means for reading the data from the recording medium, and a means for determining on the basis of the read data a region in which control information for controlling the access to these data is embedded, and extracting the control information in accordance with the condition of the embedding region and with reference to extraction rules determined correspondingly to the content of the data for extracting the condition of the embedding region. This system further has a means for selectively outputting either a read signal or a signal generated by a read signal and an access interruption signal, in accordance with the content of the extracted control information. In this structure, the media data access (reproducing and recording) system is controlled on the basis of the embedded control information by directly operating the original media data by using data hiding techniques, and the access is prohibited in accordance with the content of the information. Accordingly, the illegal copying of data can be prevented, so that literary works can be effectively protected.</p> |
