| 摘要 |
In a media key generation apparatus which generates the media key of an AACS-compatible medium according to the present invention, a search unit searches encryption values recorded on the medium for an encryption value associated with a coordinate derived from a coordinate associated with one of a plurality of device keys held in a system. A calculation unit calculates the device key value obtained by encrypting the found encryption value, from the device key associated with the coordinate 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 writes, in a nonvolatile storage medium, the calculated device key value, block identification information, and storage position information of the found encryption value in the block.
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