AACS (Advanced Access Content System) is an industrial-strength encryption technology and an elaborate key-based system for authenticating hardware and software. These keys can be modified at any time so that if unlicensed players or drives come on to the market, updated keys can be added to new video releases. The new keys can also restrict playback to older title releases or even disable a HD-DVD or Blu-ray player by modifying its firmware.
AACS also has the ability to degrade the high def video signal sent to a TV or monitor if the user has an unprotected digital or analogue connection between a player and display device.
AACS supporters point out that under a provision called Mandatory Managed Copy (MMC), content holders will be compelled to provide options for consumers to, say, copy a disc on to a home server or download content to a portable multi-media player.
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