DTCP is a copy-control scheme for digital video devised by five companies (called the "5C 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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On May 30, 2007, Certicom filed a lawsuit against Sony in United States District Court for the Eastern District of Texas Marshall office, claiming that Sony's use of ECC in Advanced Access Content System and Digital Transmission Content Protection violates Certicom's patents for that cryptographic method.