Using multiple watermarks to protect content material

Details Using multiple watermarks to protect content material Using multiple watermarks to protect content material

2001-09-20

2008-07-08

Chai, Longbit (Department: 2131)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S177000, C713S178000, C713S179000, C713S180000, C380S201000, C380S216000, C380S232000

Reexamination Certificate

active

07398395

ABSTRACT:
Content material is protected with a variety of watermarking processes. Different subsets of the protected content material are submitted to different watermarking processes. At the rendering device, a watermark detector is configured to detect one or more different watermarks. Only if the particular watermark(s) that the rendering device is configured to detect is removed from the protected content material will the rendering device permit the rendering of the protected material. If the particular watermark(s) that the rendering device is configured to detect is unpredictable, or if the particular segment that is protected by a particular watermark is undetectable, a wholesale removal of specific watermarks from the watermarked material will neither be efficient nor economically viable.

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patent: 2001/0024510 (2001-09-01), Iwamura
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