Editing Digital Transmission Content Protection

{{Short description|DRM that restricts digital home technologies}}
'''Digital Transmission Content Protection''' ('''DTCP''') is a [[digital rights management]] (DRM) technology that restricts [[digital home]] technologies including [[DVD]] players and [[television]]s by encrypting interconnections between devices. This permits the distribution of content through other devices such as [[personal computers]] or [[portable media player]]s, if they also implement the DTCP standards.<ref>[http://www.intel.com/technology/itj/2002/volume06issue04/art05_protection/vol6iss4_art05.pdf DTCP in a technical paper by Intel]</ref> DTCP has also been referred to as "5C" content protection, a reference to the five companies that created DTCP; [[Hitachi, Ltd.|Hitachi]], [[Intel]], [[Panasonic Corporation|Matsushita]], [[Sony]], and [[Toshiba]].

The standard was originally proposed in February 1998, when the five companies presented the system to the Copy Protection Technical Working Group (CPTWG), an ''ad hoc'' body organized to evaluate DRM technologies. The five companies subsequently established the [http://www.dtcp.com/ Digital Transmission Licensing Administrator] (DTLA) in June 1998 to simplify licensing procedures and promote acceptance of the DTCP method by content providers, electronics manufacturers, and broadcast service providers. They also released the [https://web.archive.org/web/20060616075812/http://dtcp.com/data/wp_spec.pdf 5C Digital Transmission Content Protection White Paper] describing the system. The paper specifies Hitachi's [[M6 (cipher)|M6]] [[cipher]] as the baseline encryption system, which was already in widespread use in the Japanese cable industry.

At the time, [[FireWire]] was widely regarded as the up-and-coming standard for interconnecting media devices, although this has not been widely adopted in the decade following. More recently there appears to be a move to using [[TCP/IP]] carried on high-speed [[ethernet]] and [[WiFi]] connections to replace FireWire and similar systems, a move epitomized by the [[Apple TV]]. The DTCP standard has branched out to cover a variety of media types to respond to these industry changes, and now supports [[Universal Serial Bus|USB]], [[Internet Protocol|IP]],<ref>[http://www.dtcp.com/documents/dtcp/info-20130605-dtcp-v1se-ip-rev-1-4-ed3.pdf Mapping DTCP to IP ("DTCP-IP")]</ref> [[WiFi]], [[Bluetooth]] and [[Media Oriented Systems Transport|MOST]]<ref>[http://www.dtcp.com/documents/dtcp/info-20120308-dtcp-v1sb-most-m6-rev-1-p-2.pdf Mapping DTCP to MOST ("DTCP-MOST")]</ref> (a media standard for automotive platforms) in addition to FireWire.

The DTCP specification is [[proprietary protocol|proprietary]] and is only disseminated to members, who agree to the DTLA agreements (some fees need to be paid to even get the specification). An "informational version" of the specification, omitting some critical details of the implementation, is freely available.<ref>{{Cite web |url=http://www.dtcp.com/documents/dtcp/info-20111214-dtcp-v1-rev-1-p-7.pdf |title=Digital Transmission Content Protection Specification Volume 1 (Informational Version) |access-date=2013-06-04 |archive-url=https://web.archive.org/web/20121202073019/http://www.dtcp.com/documents/dtcp/info-20111214-dtcp-v1-rev-1-p-7.pdf |archive-date=2012-12-02 |url-status=dead }}</ref><ref>[http://www.dtcp.com/specifications.aspx DTCP Informational Specifications]</ref>

==DTCP+==
In November 2010 the [[Digital Transmission Licensing Administrator]] proposed enhancements to DTCP known as DTCP+.<ref>{{cite web | url=http://fjallfoss.fcc.gov/ecfs/document/view?id=7020920279 | title=DTCP+ Proposed Technical Elements | date=November 10, 2010}}</ref>  This enhanced specification was due to be completed in January 2011. DTCP+ adds the following capabilities:
*Digital Only Token
*Media agnostic" way to carry Content Management Information (CMI)
*Copy Count CMI
*Remote Access capability

== See also ==
* [[CGMS-A]]
* [[High-bandwidth Digital Content Protection]]
* [[Digital rights management]]
* [[Encrypted Media Extensions]]
* [[Defective by Design]]
* [[Trusted Computing]]

==References==
{{reflist}}

== External links ==
* [http://www.dtcp.com/ DTLA home page]
* [https://web.archive.org/web/20070928210335/http://ww1.ucmss.com/books/LFS/CSREA2006/SAM4740.pdf Security analysis of the Digital Transmission Copy Protection Specification]

[[Category:Audiovisual introductions in 1998]]
[[Category:Digital rights management standards]]