DRIVE DEVICE, CONTENT REPRODUCTION DEVICE, RECORDING DEVICE, DATA READOUT METHOD, PROGRAM, RECORDING MEDIUM, AND INTEGRATED CIRCUIT

摘要

A drive device is provided to promote copyright protection by preventing playback of copied contents, even if unique identification information on a recording medium, used to generate title keys for decrypting encrypted contents, is revealed, and the contents are independently encrypted and copied using this identification information. Identification information unique to a recording medium 103 and used to generate title keys is recorded thereon, along with a signature for the identification information issued by a certificate authority terminal device 101. Before decryption and playback of the encrypted contents, a drive in a playback device 104 performs signature verification. When verification fails, the drive does not output the identification information. A program for playback in the playback device 104 therefore cannot generate a decryption key and fails to decrypt and play back the encrypted contents. The signature is not output externally. Therefore, an unauthorized individual cannot copy the recording medium 103.