The Serial Copy Management System, referred to as SCMS, provides protection from prolific, unauthorized digital duplication of copyrighted material. This protection is achieved through the use of channel status bits in the -consumer- digital audio interface standard. Any piece of equipment, either professional or consumer, containing a -consumer- digital audio interface will be required to support the SCMS protocol. This paper explains the SCMS protocol in detail, and presents several easy methods of implementation.
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https://aes2.org/publications/elibrary-page/?id=6634
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