| http://www.w3.org/ns/prov#value | - As a form of omitting it, for example, there is a case where the encoding and recording apparatus writes the encoded content key Enc_k(Kcn, IDu) in the user area 13 a of the key storage medium 10 a with the key storage medium 10 a into which the encoded user identifier Enc_m(IDu, IDm) has been written in advance being used as an object, and the like.
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