DTCP is a copy-control scheme for digital video devised by five companies (called the "5C consortium").
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Content Protection for Recordable Media (CPRM) is an encryption scheme for recordable media which is also meant to prevent media from being played back in devices other than those licensed by the 4C consortium.
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The two Authorized Outputs mentioned were Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP); the two Recording Methods mentioned were Content Protection for Recordable Media (CPRM) and D-VHS.
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