发明名称 |
Aufzeichnungs- und Wiedergabegerät |
摘要 |
A disk-shaped recording medium includes a transparent substrate, and an optical recording layer formed on the transparent substrate. A previously-recorded secret code is reproduced from the recording medium. The secret code represents second positional information. The secret code is decoded into the second positional information. The second positional information represents at least one of a predetermined reference pit depth and a predetermined reference physical position. The first positional information and the second positional information are collated, and a check is made as to whether or not the first positional information and the second positional information are in a second given relation. When the first positional information and the second positional information are not in the second given relation, one of outputting of a reproduced signal of the recording medium, operation of a program stored in the recording medium, and decoding of the secret code is stopped. |
申请公布号 |
DE69426795(T2) |
申请公布日期 |
2001.11.08 |
申请号 |
DE1994626795T |
申请日期 |
1994.07.27 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
OSHIMA, MITSUAKI |
分类号 |
G06F1/00;G06F3/06;G06F21/00;G11B7/00;G11B7/0037;G11B7/005;G11B7/007;G11B7/013;G11B7/24;G11B7/26;G11B7/28;G11B11/105;G11B13/04;G11B19/02;G11B19/04;G11B19/12;G11B20/00;G11B20/12;G11B23/28;G11B23/40;G11B27/034;G11B27/10;G11B27/11;G11B27/24;G11B27/30;G11B27/32;G11B27/34;G11B27/36;(IPC1-7):G11B7/00;G11B11/10 |
主分类号 |
G06F1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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