Marking a digitally encoded video and/or audio signal

Details Marking a digitally encoded video and/or audio signal Marking a digitally encoded video and/or audio signal

1996-10-03

2000-10-10

Gregory, Bernarr E.

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

380200, 380201, 380287, 380 51, 380 54, 380 55, 713150, 713168, 382232, 382282, G09C 500, H04L 900

Patent

active

061311618

ABSTRACT:
An electronic watermarking scheme is proposed that can significantly increase the security of copy protection mechanisms. The watermarking methods works at high level in the hierarchy of the (MPEG) source signal. This ensures that the watermark is easily detectable, but difficult to erase without significant transcoding effort. Such transcoding is considered a difficult and expensive task that may furthermore lead to loss of quality or increase in bit rate.

REFERENCES:
patent: 5267153 (1993-11-01), Shimura et al.
patent: 5416606 (1995-05-01), Katayama et al.
patent: 5488664 (1996-01-01), Shamir
patent: 5530759 (1996-06-01), Braudaway et al.
patent: 5664018 (1997-09-01), Leighton
patent: 5732157 (1998-03-01), Osawa
patent: 5748783 (1998-05-01), Rhoads

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