| http://www.w3.org/ns/prov#value | - Therefore, there is a problem that even if the user has a plurality of terminals, the right to view the content purchased by the user cannot be shared by those terminals. [0010] In sum, the conventional systems have problems that not only put a heavy load on the user's terminal apparatus but also cannot meet demand for various types of services for content usage. [0011] The present invention is co
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