| 摘要 |
<P>PROBLEM TO BE SOLVED: To copy a content to other equipment while keeping copy-once spirit. <P>SOLUTION: The content 1 imposed with copy-at-once restriction is received and acquired, it is recorded in an HDD 7, and the content format-converted for the portable content reproduction equipment 17 is recorded in the portable content reproduction equipment 17 through a bridge medium 11 by the copy. At that time, an encryption key 15 is produced from the content recorded in the bridge medium 11, an original content 1a recorded in a recording/reproducing device 5 by use of the encryption key 15 is encrypted to produce an encryption content 3. The original content 1a is deleted. <P>COPYRIGHT: (C)2007,JPO&INPIT |
