| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a configuration for efficiently generating and recording encrypted contents having a special data configuration, a key file or the like. <P>SOLUTION: In the manufacturing of an information recording medium in which a segment as a content recording unit in the information recording medium is configured so as to have a plurality of variations applying respectively different encryption keys and which stores encryption contents in which a sequence set by selecting a particular variation can be decrypted at the time of reproduction processing, encrypted contents applying an auxiliary file and a key file are generated. For example, when each sector is data for a segment part, data for a non-segment part, or data for a segment part, a segment number and a variation number are recorded in an encrypted auxiliary file, and a key to be applied to encryption to each sector data, that is, a unit key and a segment key can immediately be discriminated. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
