- DCS Copy Protection
The DCS Copy Protection technology claims to block the copying of analogue video outputs from digital video sources (Digital TV Set Top Boxes, Blu-ray players, etc), modifying the video signal so that DVD recorders, VHS machines etc cannot copy it, while TV sets can display the protected content as normal.
At least some of Hollywood’s major film studios require analogue copy protection to be present in Set Top Boxes as a pre-condition for supplying movies early in their life for sale on Pay-TV platforms.
The DCS Copy Protection technology is recognised and/or approved by:
- The Advanced Access Content System (AACS)  for use in Blu-ray players
- The Motion Picture Association of America (MPAA) 
- The Walt Disney Company 
- DVB 
- The Secure Video Processor Licensing Authority 
- Third party internet TV systems 
DCS Copy Protection Ltd
The company formerly known as Echostar Limited was renamed to DCS Copy Protection Ltd in June 2009. This company acquired some assets of Dwight Cavendish Systems Ltd some time late 2009 or early 2010, including at least some patents (e.g. see ES2334499) and the domain dwightcav.com. Operations were moved to Steeton, West Yorkshire, in July 2010.
Dwight Cavendish Systems Ltd
The technology currently deployed by DCS Copy Protection Ltd was formerly owned and developed by Dwight Cavendish Systems Ltd (incorporated January 2001), of Hertfordshire (UK), and Pasadena, CA (USA).
In 2003 DCS proposed a digital content protection system to the Analogue Reconversion Discussion Group of the (AWDG) Copy Protection Technical Working Group (CPTWG), called RightsMaster. The system claimed to enable secure protection of “Copy Once” content on future and legacy devices, using an audio watermark, a video copy label, and the company’s existing analogue copy protection.
In 2004, DCS made at least one presentation to WG-9 (The Copyright Protection Working Group) of the DVD Forum. These presentations are not published, but it seems likely that this was the start of the process which subsequently led to the DCS technology being accepted by the AACS.
Dwight Cavendish Developments Ltd
Dwight Cavendish Systems appears to have taken over the technology from Dwight Cavendish Developments Ltd (incorporated January 1980), who claimed to be working on analogue copy protection as early as September 2000.
Dwight Cavendish Developments also sold television distribution equipment for hotels, and video duplication systems (see below).
Macrovision litigation against Dwight Cavendish Developments Ltd
In January 1999, Macrovision filed a complaint against Dwight Cavendish Developments Ltd, alleging that Dwight Cavendish Developments Ltd infringed a patent held by Macrovision. In August 2001, Macrovision and Dwight Cavendish agreed to settle the litigation, resulting in a patent agreement, for which Macrovision agreed to pay Dwight Cavendish a fee of $500,000.
Video Duplication Equipment
Ironically for a company whose legacy is a product that aims to stop people copying videos, Dwight Cavendish Developments’ main product range for nearly two decades was a series of equipment for professional video duplication houses. Before the advent of DVD, pre-recorded VHS tapes were usually manufactured by recording the signal onto each tape individually, using large banks of professional (or sometimes domestic) VCRs. Dwight Cavendish Developments sold equipment to run such systems, including distribution amplifiers, and systems to control large banks of VCRs. The company also promoted a quality control system, to automatically check for faults on the pre-recorded tapes, though it is not clear if this system was ever used widely.
Laser projection TV
One of the most novel DCD products was a colour projection TV system based on multiple laser beams (for red, green, and blue light). The system boasted (for the time) impressive brightness / image size, and also, due to the coherent nature of laser light, did not require focussing. However, the coherent laser beam gave rise to a Speckle pattern in the projected image. This was ameliorated by using a rapidly vibrating screen.
The system was intended for commercial and industrial applications, using 28 kW of electricity, and requiring 4.75 gallons of water per minute for cooling.
- US4613201 Light projection apparatus(Laser TV system; 1982)
- US6882490 System for protection against copying on magnetic tape recorders (Analogue audio copy protection; 1999)
- EP1319308 Method and apparatus for processing a video signal for attaining copy protection, a video signal obtained therewith and the use thereof (Analogue video Copy Protection: vertical sync modification; 2000)
- WO03065716 Anti-copy protection for a video signal (Analogue video Copy Protection: two signal modifications; 2002)
- EP1926318 An improved method and apparatus for providing an anti-copy video signal (Analogue video Copy Protection: three signal modifications; 2002)
- WO2004110060 Digital processing disruption systems (Digital video Copy Protection: two or three signal modifications; 2003)
- US7471479 System for protection against copying on magnetic tape recorders (Analogue audio copy protection; 1999)
- WO2006040565 Audio copy protection system (Analogue audio copy protection: pulsed signal modification; 2004)
- WO2007000585 Copy protection method and apparatus (Analogue video copy protection: frequency modification; 2005)
- WO2009053685 Method and apparatus for generating a security signature (Digital video copy protection: fingerprint generation; 2007)
- ES2334499 Method for preventing copying if (sic) a programme signal (Analogue video Copy Protection: three signal modifications; 2002 pub 2010)
- ^ http://www.avsforum.com/avs-vb/showthread.php?t=1169141&page=3 post by Keith Jack, Sigma Designs
- ^ http://www.dwightcav.com/ DCS Copy Protection Ltd Homepage
- ^ http://www.echostar.com/Services/ContentProtection.aspx Echostar link to DCS Copy Protection Ltd
- ^ http://www.dwightcav.com/?page_id=3 DCS Copy Protection Ltd Website 'Technology' section
- ^ http://dtv-guru.blogspot.com/2006/10/how-many-ways-to-signal-copy.html
- ^ http://books.google.co.uk/books?id=ikxuL2aX9cAC&pg=PT186&dq=dwight+cavendish+systems&cd=2#v=onepage&q=dwight%20cavendish%20systems&f=false DVD demystified, Jim Taylor, Mark R. Johnson, Charles G. Crawford, McGraw-Hill Professional, 2005 - page 5-15
- ^ http://meetings.waea.org/edu_events/tech_committee/2008/1-08/DisneyContentProtection.pdf Content Protection - Process Overview - The Walt Disney Studios
- ^ http://www.aacsla.com/license/AACS_Adopter_Agrmt_090619.pdf
- ^ http://www.aacsla.com/license/AACS_Content_Participant_Agrmt_090619.pdf
- ^ http://www.aacsla.com/license/AACS_Content_Provider_Agrmt_090619.pdf
- ^ http://www.bloobble.com/broadband-presentations/presentations?itemid=1062 Content Protection Enabling new choices for consumers - Jim C. Williams, Senior Vice President & Chief Technology Officer, Motion Picture Association of America - slide 8
- ^ http://meetings.waea.org/edu_events/tech_committee/2008/1-08/DisneyContentProtection.pdf Content Protection - Process Overview - The Walt Disney Studios - page 12
- ^ http://www.dvb.org/technology/standards/A094r4_CPCM_Part_13_Compliance_Framework.pdf CPCM Compliance Framework, Table 10, Rules for Analogue Consumption
- ^ http://svpla.com/docs/QRC034c.pdf Secure Video Processor Device Manufacturer License Agreement, section 6, Output Rules
- ^ http://www.freepatentsonline.com/20100064331.pdf US Patent Application US2010/0064331
- ^ http://www.faqs.org/patents/app/20080263621 US Patent Application 20080263621 - Set top box with transcoding capabilities
- ^ UK Companies House search April 2010, Company No. 04667708
- ^ http://v3.espacenet.com/publicationDetails/biblio?DB=EPODOC&at=15&locale=en_GB&FT=D&CC=ES&NR=2334499T3&KC=T3 ES2334499 on Espacenet (retrieved April 2010)
- ^ http://www.dwightcav.com/
- ^ http://www.dwightcav.com/?p=72 DCS Copy Protection press release about office relocation
- ^ UK Companies House search April 2010, Company No. 04145237
- ^ http://web.userinstinct.com/7319921-dwight-cavendish-systems.htm Directory Entry for former Dwight Cavendish systems offices in Pasadena, CA
- ^ http://www.cptwg.org/Assets/Presentations/ARDG/ARDG%20page.htm
- ^ http://www.cptwg.org/
- ^ http://www.cptwg.org/Assets/Presentations/ARDG/ARDG-10-03/Rightsmaster-DCavendish.ppt RightsMaster presented to ARDG 2003-10-23
- ^ http://w2.eff.org/IP/Video/ardg_eff_comments.php
- ^ http://web.archive.org/web/20080502203843/http://analog.blogs.eff.org/
- ^ http://www.cptwg.org/Assets/Presentations/Pres%202004/WG9_CPTWG_2004_03_03a%20rev.pdf Status Report from WG9/DVD Forum on Copy Protection System, slide 6
- ^ http://www.dvdforum.org/about-charter-11-15-07.htm
- ^ UK companies House search April 2010, Company No. 01474951
- ^ http://www.cptwg.org/Assets/September%20presentations/Digital_Protection_DC.ppt Dwight Cavendish Developments presentation to the Copy Protection Technical Working Group - 20th September 2000
- ^ http://books.google.co.uk/books?id=U0BWAAAAMAAJ&q=dwight+cavendish&dq=dwight+cavendish&cd=2 Wireless world, Volume 89 - Page 314, 1983
- ^ http://sec.edgar-online.com/macrovision-corp/10-q-quarterly-report/2001/08/15/section10.aspx 10-Q SEC Filing, filed by MACROVISION CORP on 8/15/2001
- ^ http://dwightcavendish.com/dc_products.html Small list of end-of-line Dwight Cavendish equipment from US distributor’s website. Retrieved April2010
- ^ http://books.google.co.uk/books?id=UDcqAQAAIAAJ&q=dwight+cavendish+quality&dq=dwight+cavendish+quality&cd=2 BM/E: The magazine of broadcast management/engineering, Volume 25, Part 2 - Page 70, Mactier Pub. Corp., 1989
- ^ http://www.encyclopedia.com/doc/1G1-20218973.html "Quality Master:" Dwight Cavendish's Kent Kjellgren on video QC. Tape-Disc Business, December 1, 1997
- ^ http://books.google.co.uk/books?id=UlBWAAAAMAAJ&q=dwight+cavendish&dq=dwight+cavendish&cd=1 Electronics, Volume 56, McGraw-Hill Pub. Co., 1983, Page 88
- ^ http://books.google.co.uk/books?id=gFCfVJ4MHFsC&pg=PA20&cd=8#v=onepage&q&f=false Popular Science, December 1986, Page 20, Laser TV
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