| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk which is to be loaded on a computer game- purpose optical disk device and is able to prevent reproduction of a copied disk, and a computer game-purpose optical disk device for reproducing such an optical disk. SOLUTION: In a frame structure 4 of a sub-code Q of an optical disk (CD-DA: audio CD), an elapsed time 12 in a movement and an absolute time 14 are arranged. The elapsed time 12 in the movement and the absolute time 14 are composed of a frame number, second, and minute, respectively, and they are arranged in a row different from that of the format according to the CD standards.
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