| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent information recorded on a hard disk with copy restriction thereof from being copied onto other hard disks by means of a PC, etc., producing a large number of illegal copies, i.e., violating a copyright. <P>SOLUTION: The information is recorded onto a hard disk drive through encryption thereof, using an identification being the number unique thereto, when it is recorded onto the hard disk. With this, normal reproduction is prevented, since the drive identification number necessary for decryption is different, even if it is copied onto the other hard disk. Also, version information of the hard disk is memorized in an information management circuit. When the information is illegally copied onto the other hard disk, the version information is changed; therefore it does not coincide with the version information memorized in the information management circuit. With this, the reproducing operation is prohibited. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
