| 摘要 |
A content including replay condition information is encrypted using first key information while being recorded to a recording medium. The first key information is encrypted using the replay condition information and second key information while being recorded to the recording medium together with the replay condition information. The replay condition information and the first key information are read from the recording medium, and the first key information is decrypted using the replay condition information and the second key information. The content read from the recording medium is decrypted using the decrypted first key information.
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