CONTENT RECORDING DEVICE CAPABLE OF PREVENTING UNAUTHORIZED USE OF CONTENT

摘要

A content recording apparatus reads from a medium (310) a medium identifier Mid unique to a medium recording content Co (S103) and employs identifier Cid unique to content Co to generate an individualization key Km (S105). Furthermore, the apparatus encrypts a content key Kc, which has been used to encrypt content Co, with individualization key Km to generate an individualized content key (S107) and stores content identifier Cid and the individualized content key together with encrypted content to medium (310) (S109). A content utilization apparatus encrypts content identifier Cid by medium identifier Mid to generate individualization key Km (S135) and decrypts the individualized content key to obtain content key Kc (S139) and decrypt the encrypted content (S143).