Collusion-robust watermarking
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United States of America Patent
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N/A
Issued Date -
May 19, 2005
app pub date -
Aug 16, 2004
filing date -
Feb 19, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Watermark embedding is often used to identify multiple copies (Qi) of the same content (Q). Each copy (Qi) is provided with a different private watermark (Wi) which, for example, identifies the player on which that copy may be reproduced. Private watermarks can be hacked. Averaging two or more watermarked copies may cause any of the private watermarks to become undetectable. The watermark embedder (10) in accordance with the invention embeds a global (fixed) watermark (W) in addition to the private watermark (Wi). The global watermark is the same in each copy and therefore remains detectable. Its presence indicates that a private watermark shall be present as well. It can be used in a protocol like: no playback allowed if the global watermark is present and a private watermark is not found.
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