Non-repudiation oblivious watermarking schema for secure digital video distribution

This paper presents a mechanism and algorithm for creating undeniable watermarks. It assumes a system where a content owner or provider uses outside agents to distribute its content. Content watermarked by distribution agents using this system will be undeniably recognizable by the content provider as originating with that distribution agent. That is to say that given N distribution agents, the content provider will be able to tell which distribution agent watermarked the content. The system does not allow any distribution agent to watermark content that would appear to have been watermarked by another agent and it does also not allow the content provider to watermark content that would appear to have been watermarked by a particular distribution agent. This allows the content provider to place a high degree of trust in the identification of the distribution agent and trace "leak" locations of pirated copies of videos.