| 摘要 |
In a media key generation apparatus (10) which generates the media key of an AACS-compatible medium according to the present invention, a search unit (12) searches encryption values (A) recorded on the medium (M) for an encryption value (A) associated with a coordinate (Nr) derived from a coordinate associated with one of a plurality of device keys (Dk) held in a system (30). A calculation unit (14) calculates the device key value (Dk) obtained by encrypting the found encryption value (A), from the device key (Dk) associated with the coordinate (Nr) serving as a derivation source on the basis of the derivation relationship between the coordinate associated with the found encryption value and the coordinate serving as the derivation source. A write unit (16) writes, in a nonvolatile storage medium (18), the calculated device key value (Dk), block identification information (Ver), and storage position information (H) of the found encryption value (A) in the block (Mkb).
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