发明名称 |
Anti-chipping recording disc, reading method and recording head |
摘要 |
An anti-piracy recording disk. The disk includes a main recording track which has interruptions or changes of turn. This gives rise to non-sequential reading and therefore to information which is difficult to access. The copying of such a disk by conventional means is very difficult making it possible to easily detect counterfeits or to render any copy unusable.
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申请公布号 |
US6577561(B2) |
申请公布日期 |
2003.06.10 |
申请号 |
US19990308255 |
申请日期 |
1999.05.25 |
申请人 |
THOMSON-CSF |
发明人 |
PIROT FRANCOIS-XAVIER;LEHUREAU JEAN-CLAUDE |
分类号 |
G11B7/007;G11B20/00;G11B23/28;(IPC1-7):G11B7/085 |
主分类号 |
G11B7/007 |
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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