| 摘要 |
According to a first aspect of the present invention, a recording medium manufactured without using the latest key management information can be detected and accuracy of content protection can be improved. A license association apparatus generates a digital signature uniquely corresponding to the latest key management information and content data. A disc manufacturer apparatus writes this digital signature together with the key management information, encrypted content, content feature information onto a DVD. Accordingly, the recording media manufactured without using the latest key management information can be detected by confirming unique correspondence among the key management information, the content feature information and the digital signature and unique correspondence between the encrypted content and the content feature information, in advance of playback.
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