| 摘要 |
PROBLEM TO BE SOLVED: To prevent an unfair copy. SOLUTION: This device is an optical disk recording/reproducing device recording and/or reproducing information on an attachable/detachable optical disk 7, and though a recording/reproducing circuit 3 reads out disk manufacture identification information Disk Idr being first identification information and disk record identification information Disk Idm being second identification information from the optical disk 7, when the disk record identification information Disk Idr is not recorded on the optical disk 7, and the disk record identification information Disk Idr is not obtained, a control circuit 2 controls so as to write a random number generated in a random number generation circuit 10 on the optical disk 7 as the disk record identification information Disk Idr. |
