| http://www.w3.org/ns/prov#value | - An organization which transmits and receives data to and from the devices, such as a content server, a license server, or a shop server, functions as message-data delivery means. [0127] The node keys and the leaf keys may be managed together by a single management system having a key management center function, or may be managed group-by-group by the message-data delivery means, such as a provider
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