发明名称 |
COPYRIGHT PROTECTION METHOD AND DEVICE FOR HIGHLY PRECISE VIDEO SIGNAL, BROADCAST SYSTEM, RECEIVING DEVICE, RECORDING AND REPRODUCING METHOD AND DEVICE, AND REPRODUCING METHOD AND DEVICE |
摘要 |
PROBLEM TO BE SOLVED: To surely protect the copyright by superimposing the information which is generated from the attendant information added to the highly precise video signals for protection of the copyright on the converted video signals as the electronic watermark information. SOLUTION: At the WM addition parts 106, 110 and 114, the duplication control signals are generated from the CGMS-D information which is decoded at a copy generation management system(CGMS) decoding part 105 and under the control of a control part 120. The PN codes which are used as the diffusion codes are generated in a sufficiently early cycle and multiplied by the duplication control information serving as the additional information to perform the spread spectrum and to convert the duplication control information of a narrow band and a high level into the signals of a wide band and a minute level which never affect the video signals. Then the duplication control information undergone the spread spectrum are superimposed on the video signals and transmitted. |
申请公布号 |
JP2000333141(A) |
申请公布日期 |
2000.11.30 |
申请号 |
JP19990142680 |
申请日期 |
1999.05.24 |
申请人 |
SONY CORP |
发明人 |
OGINO AKIRA;NAKAMURA SHINJI |
分类号 |
H04N5/91;G06F21/10;G09G5/00;G11B20/10;H04N7/08;H04N7/081;H04N7/167;H04N21/435;H04N21/4402 |
主分类号 |
H04N5/91 |
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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