发明授权
US06529600B1 Method and device for preventing piracy of video material from theater screens
失效
用于防止视频素材从剧院屏幕盗版的方法和装置
- 专利标题： Method and device for preventing piracy of video material from theater screens
- 专利标题（中）： 用于防止视频素材从剧院屏幕盗版的方法和装置
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申请号： US09104900申请日： 1998-06-25
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公开(公告)号： US06529600B1公开(公告)日： 2003-03-04
- 发明人: Michael Epstein , Douglas A. Stanton
- 申请人： Michael Epstein , Douglas A. Stanton
- 主分类号： H04N7167
- IPC分类号： H04N7167
摘要：
A method and device for preventing video tape piracy of video material shown by an electronic projector by varying frequently the frame rate, line rate or pixel rate of the projector. In a preferred embodiment the frame rate is varied in accordance with a cryptographically secure algorithm. In another embodiment the frame rate is varied in accordance with the content of the scene in the film.
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