发明授权
- 专利标题： Information-signal playback system, information-signal reading apparatus, information-signal processing apparatus, information-signal playback method, information-signal reading method and information-signal processing apparatus
- 专利标题（中）： 信息信号再现系统，信息信号读取装置，信息信号处理装置，信息信号再现方法，信息信号读取方法以及信息信号处理装置
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申请号： US09351399申请日： 1999-07-13
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公开(公告)号： US07548887B1公开(公告)日： 2009-06-16
- 发明人: Akira Ogino , Yuji Kimura , Tadashi Ezaki , Teruhiko Kori
- 申请人： Akira Ogino , Yuji Kimura , Tadashi Ezaki , Teruhiko Kori
- 申请人地址： JP Tokyo
- 专利权人： Sony Corporation
- 当前专利权人： Sony Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
- 优先权： JP10-200264 19980715
- 主分类号： G06F17/00
- IPC分类号： G06F17/00
摘要：
The present invention relates to an apparatus and a method for protecting the copyright of an information signal recorded on a recording medium such as a DVD (Digital Video Disc) for presenting the signal to the user or an information signal transmitted through transmission media such as the Internet and for preventing an illegal copy of such an information signal. To put it in detail, information on copyright protection which is read out from the recording medium and information on copyright protection which is encrypted to make the information difficult to alter is used. If both of the information do not match each other, the information on copyright protection is judged to have been altered in an attempt to play back the information signal which is obtained as a result of an illegal copy operation in which case, the operation to play back the information signal is disabled.
信息查询
