| http://www.w3.org/ns/prov#value | - Therefore, it is possible to securely transmit a content key that can be used only an authorized device without necessitating a process between transmitting and receiving devices, such as authentication, production of a session key, and encryption of the content key Kcon using the session key. [0222] When it is desired to transmit a content key such that it can also be used by the PC and the playb
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