CSS
Content Scrambling System (CSS), implemented by the DVD Consortium, implements the Analog Protection System (APS) and the Data Encryption Standard (DES), to protect the contents of a DVD-Video title from being downloaded or dumped and reused. One major option that implements the APS is Macrovision (to degrade the analog stream being copied). The technology involves special DES algorithms to scramble critical sectors of the DVD-Video, creation of special 'keys' for guiding the descrambling process by chips in the DVD-player or on an add-in board in the PC, and use of an APS to prevent an analog signal be diverted or captured 'clear' or at high quality (before it reaches the monitor or TV screen).
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