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Blu-ray & HD DVD: New Copy Protection Technology Being Added

Audio watermarking is now available, via Verance Corp., for licensing by Blu-ray and HD DVD studios to protect discs from being copied illegally. The technology works by embedding an inaudible audio stream within a film's soundtrack, which will then be checked by the player to see if the stream being played is legal. If that stream is missing, or incorrect, the file will not be played.

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