发明授权
- 专利标题： Optical recording disc capable of preventing illegal copy
- 专利标题（中）： 能够防止非法复制的光记录盘
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申请号： US09487867申请日： 2000-01-20
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公开(公告)号： US06438097B1公开(公告)日： 2002-08-20
- 发明人: Seiji Kajiyama , Youichi Tsuchiya , Kenji Torazawa , Kouichi Tada
- 申请人： Seiji Kajiyama , Youichi Tsuchiya , Kenji Torazawa , Kouichi Tada
- 优先权： JP9-240359 19970820; JP9-240432 19970820
- 主分类号： G11B724
- IPC分类号： G11B724
摘要：
Micro-pits or micro-pit strings, which are disabled precise copying by means of illegal copying described above and enable signals different from signals of a normal disc to be detected in case of failure in precise copying, are recorded in a copy protected area of an optical disc beforehand. A read unit checks the copy protected area and determines a loaded disc is legal disc or illegally copied disc. If illegal, reading is prohibitted.