发明名称 |
Digital video copy protection system |
摘要 |
A formatting apparatus authenticates an information signal prior to mass duplication of the signal by analyzing the signal to detect the presence or absence of a security signal therein, inserting a security signal into the information signal, and recording the modified signal only if no security signal was detected.
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申请公布号 |
US5703859(A) |
申请公布日期 |
1997.12.30 |
申请号 |
US19960705306 |
申请日期 |
1996.08.29 |
申请人 |
SONY CORPORATION |
发明人 |
TAHARA, KATSUMI;KOYANAGI, HIDEKI;YAGASAKI, YOICHI;FUJINAMI, YASUSHI |
分类号 |
H04N5/913;H04N5/926;H04N7/24;(IPC1-7):G11B3/64 |
主分类号 |
H04N5/913 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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