Recording medium, recording medium method and apparatus ,...

Details Recording medium, recording medium method and apparatus ,... Recording medium, recording medium method and apparatus ,...

2007-10-16

2007-10-16

Vu, Kim (Department: 2135)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S193000, C380S201000, C380S210000, C382S100000, C283S113000

Reexamination Certificate

active

10204982

ABSTRACT:
A record medium for recording an information signal in which a first watermark and a second watermark have been embedded, the first watermark being embedded when the information signal is transmitted as an analog signal, the second watermark being embedded when the information signal is further transmitted.

REFERENCES:
patent: 5809139 (1998-09-01), Girod et al.
patent: 6591365 (2003-07-01), Cookson
patent: 6674874 (2004-01-01), Yoshida et al.
patent: 6707774 (2004-03-01), Kuroda et al.
patent: 6804452 (2004-10-01), Kuroda et al.

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