| 摘要 |
<P>PROBLEM TO BE SOLVED: To change encryption key information during the operation even in a single program or title according to a user setting, and divide the program or title into multiple parts for moving from one to another even in a protection system capable of moving in units of encryption keys. <P>SOLUTION: This device comprises an encryption section for encrypting the content to be recorded in units of encryption keys, a first disk driver for recording the encrypted content in a first recording medium and reading out the recorded encrypted content, a deletion process section provided within the first disk driver to delete the encrypted content from the first recording medium when the content encrypted in units of encryption keys is read out by means of a move command, and a key change process section for changing the encryption key to be used in the encryption section in any setting units during consecutive content recording by the first disk drive. <P>COPYRIGHT: (C)2008,JPO&INPIT |
