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Architectures for forensic watermarking in A/V products

Posted: 05 Dec 2006     Print Version  Bookmark and Share

Keywords:DRM  forensic watermarking  A/V 

An increasing variety of entertainment content is being distributed under control of DRM technology. DRM imposes limitations on the storage and rendering of the content. It constrains the consumer's ability to make copies or redistribute the content, but DRM technology alone cannot enforce this aspect.

Forensic watermarking embeds information into the content to facilitate the tracing of unauthorised copies back to the last legitimate handling of the content where the forensic watermark was applied. Its purpose is to aid in locating leaks in the content distribution chain, and to provide evidence to support the appropriate corrective action.

Two distinct architectural models exist for forensic watermarking. The single-ended approach is conceptually straightforward and appropriate for less demanding environments. Where rendering device cost is a significant factor, the replacement model offers compelling advantages.

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