Cinavia is a digital rights management system created by Verance. It requires two parts to work: a proprietary imperceptible audio watermark, and a piece of hardware which is able to detect that watermark. Known hardware which can detect Cinavia watermarks include the PlayStation 3 (Began With V3.10 System Software), as well as newer Blu-ray players. Cinavia is not detected in a DTS audio stream on PS3 (Must have HDMI w/DTS receiver).[1]
http://en.wikipedia.org/wiki/Cinavia
