发明授权
- 专利标题： Information transmission method, information duplication prohibiting method, information duplication prohibition device and information crevording medium
- 专利标题（中）： 信息传输方式，信息复制禁止方式，信息复制禁止装置和信息创作媒介
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申请号： US08968118申请日： 1997-11-12
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公开(公告)号： US06453118B2公开(公告)日： 2002-09-17
- 发明人: Takehiro Sugita , Akira Ogino , Takashi Usui
- 申请人： Takehiro Sugita , Akira Ogino , Takashi Usui
- 优先权： JP8-323486 19961119
- 主分类号： H04N591
- IPC分类号： H04N591
摘要：
The level of the spectrally spread anti-duplication control signal to be superimposed on an information signal such as a video signal is changed by using a random number RD generated by a random number generation unit 163. Since it is difficult to follow after the change of the level of the spectrally spread anti-duplication control signal, elimination of the anti-duplication control signal from the information signal is made further difficult. This can reliably provide the anti-duplication control signal to the receiving side.