| http://www.w3.org/ns/prov#value | - By generating a KRB unique to each recorder/player or recording medium and delivering it to them via a network or medium, it is possible to renew the key easily and safely. [0400] Thus, according to the present invention, it is possible to built an information recording/playback system in which copyrighted data such as movie, music or the like can be prevented from being copied illegally (against
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