| http://www.w3.org/ns/prov#value | - Furthermore, the data protection system may include a key storage device that determines, when it is supposed that each terminal is corresponded with a node on a lowest level in an N-ary (N being a natural number equal to or greater than three) tree structure having a plurality of hierarchies, for each node other than the nodes on the lowest level, a plurality of combination patterns, for each one
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