| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To more surely prevent data from being illegally copied. <P>SOLUTION: Data encrypted by a 1394 interface 26 of a DVD player 1 are transmitted to a personal computer 2 and an opto-magnetic disk device 3 via a 1394 bus 11. In the opto-magnetic disk device 3 in which a function modification is not released to users, received data are decrypted using a 1394 interface 36. In the personal computer 2 in which a function modification is released to users, on the other hand, encrypted data are decrypted using a time change key (i) in a 1394 interface 49 and a result of decryption is further decrypted using a session key S in an application section 61. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
