发明授权
US06301663B1 Copy protection apparatus and information recording medium used in this copy protection apparatus
失效
该复印保护装置中使用的复印保护装置和信息记录介质
- 专利标题： Copy protection apparatus and information recording medium used in this copy protection apparatus
- 专利标题（中）： 该复印保护装置中使用的复印保护装置和信息记录介质
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申请号： US09195918申请日： 1998-11-19
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公开(公告)号： US06301663B1公开(公告)日： 2001-10-09
- 发明人: Taku Kato , Takehisa Kato , Kenjiro Endoh , Hisashi Yamada , Naoki Endoh
- 申请人： Taku Kato , Takehisa Kato , Kenjiro Endoh , Hisashi Yamada , Naoki Endoh
- 优先权： JP9-361980 19971120; JP10-323879 19981113
- 主分类号： H04L900
- IPC分类号： H04L900
摘要：
This invention protects the unauthorized copy of multimedia data, recorded on an information recording medium, by using electronic watermark information and key information. The electronic watermark information embedded in the multimedia data is extracted by an electronic watermark extraction unit on the decryption system side. A disk key is obtained using the electronic watermark information and a part master key. The multimedia data is decrypted using the resultant disk key.
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