| http://www.w3.org/ns/prov#value | - in the above information recorder according to the present invention, the encryption key generating data is a medium key unique to a specific recording medium. [0019] Also in the above information recorder according to the present invention, the node key can be renewed, there is distributed, when a node key is renewed, a key renewal block (KRB) derived from encryption of the renewal node key with
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