| 摘要 |
PROBLEM TO BE SOLVED: To obtain the authentication of a device to which data is sent when the data is transmitted to the device. SOLUTION: A key distribution center 2 distributes a public key PK<SB>App</SB>or reference information 6 including version numbers 6d, 8b, etc. or a certificate list 8 to a regeneration program 20, and distributes reference information 7 and version information 9 to a disk drive 16. That is, the center distributes these information separately to the program 20 and the disk drive 16. The disk drive 16, which has the reference information 7 and the version information 9 necessary for determining the validity of the program 20, permits contents data 24 recorded in an optical disk 4 transmitted to the program 20 when the version is identical or newer. COPYRIGHT: (C)2004,JPO |
