| http://www.w3.org/ns/prov#value | - key as a decryption key for a block data including more than one packets each having the arrival time stamp (ATS) appended thereto, and the block key as a decryption is generated, in decryption of the encrypted data stored in the recording medium, based on data including the decryption key generating data and a block seed being additional information unique to the block data including the arrival
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