What is Digital Copy Protection System (DCPS)?

In order to provide digital connection between components not allowed perfect digital copies, five digital copyright protection systems were brought up the CEA. DTCP (digital transmission content protection) is the first one, which focuses on IEEE 1394/FireWire but can be applied to other agreement yet. The draft proposal (called 5C, for the five companies that developed it) was made by Intel, SONY, Toshiba, Hitachi and Matsushita in February 1998. SONY released a DTCP chip in 1999. Under DTCP system, equipments are connected to a DVD player and digital television or digital video recorders, exchanged keys and authentication certificate to establish a safe passage.

The encrypted audio/video signal that the DVD player sent to the receiving devices must decrypt it. This avoid that some unauthenticated devices connected to stealing the signal. The content without copy protection needs no encryption. "Update" security renewed by new content, such as new discs or new broadcasts, and new devices that carry updated keys and revocation lists to identification or illegal compromise equipment.

A competitive proposal, XCA extended conditional access, from Zenith and Thomson, is similar to DTCP but can work in one-way digital interface (such as the EIA-762 RF remodulator standard) and use cards for the regeneration safety. Other Suggestions were MRJ Technology, Philips and NDS. In all the five proposals, content is marked with CGMS-style flags of "copy freely", "copy once," "don't copy," and sometimes "no more copies". Digital equipment, what also do not exceed copying audio-visual can receive all material (as long as can confirm that they are playback - how device). Digital recording equipment, can only receive data, such as, they must change copyable flag," don't copy "or" no more copies "if the source is" copy once ".

DCPS is designed for the next generation of digital TV, digital receivers, and digital video recorder. They need a new DVD players and digital connector, such as those in the digital equipment. These new products began to appear in 2003. Since encryption is done to the DVD player, and not change the discs.