CONTENT PROTECTION DEVICE, CONTENT PROTECTION METHOD, CONTENT PROTECTION PROGRAM, DEVICE INCLUDING CONTENT PROTECTION DEVICE, AND INFORMATION PROCESSING DEVICE INCORPORATING DEVICE

摘要

To sufficiently prevent content from being unauthorizedly used even regardless of the unauthorized acquisition of a key for content protection.SOLUTION: A content protection device includes: a storage unit for storing a key set of an encryption block encryption key set, a public key and an encryption secret key; a secret key generation unit for decrypting the encryption secret key of the key set with an identifier unique to a device, and generating a decryption secret key; a block encryption key set generation unit for decrypting the encryption block encryption key set of the key set with the decryption secret key, and generating a decryption block encryption key set; and a block encryption and decryption unit for encrypting and decrypting content by using the decryption block encryption key set.SELECTED DRAWING: Figure 1