| http://www.w3.org/ns/prov#value | - Furthermore, respective corresponding areas A(1) to A(4) of quadrisected contents data A may be enciphered by cipher keys buried in respective advertisement data of advertisements 1 to 4. [0171] In accordance with the above-described examples, when information desired to be necessarily reproduced such as advertisement or copyright management information, etc. is not reproduced, it is impossible to
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