Editing VideoGuard

{{Short description|Conditional access system for satellite television}}
[[File:NDS VideoGuard.png|right]]
'''VideoGuard''' (sometimes referred to simply as ''NDS''), produced by [[NDS Group|NDS]], is a digital [[encryption]] system for use with [[conditional access]] television broadcasting. It is used on digital [[satellite television]] systems – some of which are operated by [[News Corporation (1980–2013)|News Corporation]], which owned about half (49%) of NDS until its sale to [[Cisco]] in 2012 (becoming [[Cisco Videoscape]] division).<ref>{{Cite web|url=http://newsroom.cisco.com/press-release-content?type=webcontent&articleId=712002|title = Cisco Announces Intent to Acquire NDS}}</ref> Since 2018 VideoGuard is improved and maintained by [[Synamedia]] (Cisco's spun-off company based on its former Videoscape division). Its two most widely used implementations are '''[[Sky UK|Sky]]''' in the [[United Kingdom]] and [[Republic of Ireland|Ireland]] and '''[[DirecTV]]''' in the [[United States]], the former of which launched the digital version of the system in 1998.

==History==
Since the majority of content provided by companies like BSkyB requires subscription, VideoGuard protects that content by encrypting both standard subscription channels and [[pay-per-view]] movies and events. Access flags can be downloaded to the subscriber's card either over the air (via 'hidden' data streams) or by using the [[set top box|box's]] built in [[modem]], thereby allowing rapid changing of channel packages and ordering of events.
 
Already in use in America since 1997, the VideoGuard system was introduced to the UK by NDS in 1998 with the launch of Sky Digital, replacing the [[VideoCrypt]] system (also supplied by NDS) in use on Sky's analogue broadcasts. Despite widespread [[Pirate decryption|piracy]] of the US DirecTV service between 1997 and 2002, the implementation in the UK remained secure until 2014 when a BBC investigation revealed that some companies in south London offered pirated Sky TV sold for £10 a month. The BBC report quoted Keith Cottenden, forensic services director at consultants Cy4or, said in February 2014 that there were some areas in the UK where those hacking satellite TV outnumber viewers paying for it legitimately.<ref>[https://www.bbc.co.uk/news/uk-england-london-26052012 Pirated Sky TV sold for £10 a month]</ref>

Various pay-per-view flaws have been identified in the past, related merely to the circuitry of the set-top box (STB), rather than the NDS card. It is suspected that the version initially used by Sky was either insecure or close to being broken, as a software update rolled out to all boxes required replacement of the BSkyB subscriber's viewing card. Even so, wholesale card replacements are rare, currently having occurred just twice during the lifetime of Sky Digital – once in 2002/2003, and again in 2009 (replacements carried out between April and June).

While most commonly used to protect pay-TV, VideoGuard is also used by numerous non-subscription broadcasters to enforce geographic rights restrictions. VideoGuard has been used by the BBC, ITV, and Channel 4 to restrict non-UK viewing, although in recent years these broadcasters have moved to broadcasting FTA on the more geographically restricted footprint of the [[Astra 2D]] satellite which is mainly, although not entirely, focused on the UK and Ireland. In some cases, encryption is still used on some versions of ITV and Channel 4 services where rights issues or a lack of capacity on the Astra 2D satellite are an issue.

Many broadcasters choose to ''pair'' their cards, meaning that a paired (also called "married") card can be used only in a specific broadcaster-supplied STB, or by using the serial number from said receiver with one of the reverse-engineered solutions. In the case of Sky, all cards are ''married'' to a particular STB, although almost all non-premium channels will still allow viewing even if the box and card are not paired. Other channels, such as Sky's sports and movie channels, cannot be viewed unless the viewing card is being used in its specifically ''paired'' set top box.

==Reverse engineering==

VideoGuard is unusual in that legitimate external [[conditional-access module]]s are not available, the encryption system instead being built into the hardware and firmware of platform-supplied set-top boxes. However, several groups have managed to reverse-engineer VideoGuard to the point where a legitimate subscriber's card can be utilised in third-party receivers to decrypt those channels which that subscriber is authorised to view. A software CAM emulator exists for the [[Dreambox]] & [[Triple-Dragon]] [[Linux]]-powered satellite receivers, along with the Diablo, Dragon, Giga-Blue and T-Rex conditional-access modules. Some of the reverse-engineered solutions are unable to update the card, meaning the legitimate card needs to be returned to official Sky receiver for a few hours (or overnight) to be refreshed, or programmes will no longer decrypt. An example of a reverse-engineered solution that does support card updates is NDSCam.<ref>ReadMe.txt from NDSCam ver.0.0.0.7</ref>

==Sky 2009 card replacements==
As of late March 2009, BSkyB have begun issuing replacement NDS smartcards. These new cards are believed to close off the current software CAM loophole.

== Supported broadcasters==
Several other broadcasters than Sky or DirecTV around the world use the VideoGuard system, including: 
*[[Vrio Corp.|DirecTV (Latin America)]] 
*[[Hot (Israel)]], [[Yes (Israel)]]
*[[Viasat (Nordic television service)|Viasat]] (Scandinavia)
*[[Sky Italia]] (Italy)
*[[Sky Deutschland]] (Germany)
*[[Sky Brazil]] (Brazil)
*[[Sky Television (New Zealand)|Sky Network Television]] (New Zealand)
*[[Foxtel]] (Australia)
*[[Airtel dth|Airtel DigitalTV]] (India)
*[[Tata Sky]] & [[Hathway]] ([[DVB-C]]) (India)
*[[Astro (television)|Astro]] (Malaysia)
*[[TrueVisions]] (Thailand)
*[[D-Smart]] (Turkey)
*[[TotalTV]] (Balkan)
*[[ONO (Spain)]]
*[[Canadian Broadcasting Corporation]] (Canada)
*[[China Central Television]] (China)
*[[Serbia Broadband|SBB]] (Serbia)
*[[KabelBW]] (Germany)
*[[Vivacom]] (Bulgaria)
*[[Dolce (satellite television)|Dolce]], now [[Telekom TV]] (Romania)
*[[Disney Networks Group Asia Pacific|STAR TV]]/[[Fox Networks Group|Fox International Channels]] (Asia)
*[[Cignal Digital TV]] (Philippines)
*[[Aora]] <small>(currently discontinued)</small> (Indonesia)
*[[MNC Vision]] <small>(formerly known as Indovision, OkeVision, and Top TV)</small> (Indonesia)
*[[Orange Romania|Orange Home TV cable]] (Romania)
*[[OTAU TV]] (Kazakhstan)
*[[OTE TV]] (Greece)
*[[Oi TV]] (Brazil)

==References==
{{reflist}}

==External links==
* [https://www.synamedia.com/video-solutions/video-security/ Informations on video security products from Synamedia (including VideoGuard)]

{{broadcast encryption}}

{{DEFAULTSORT:Videoguard}}
[[Category:Digital television]]
[[Category:Conditional-access television broadcasting]]
[[Category:1997 introductions]]
[[Category:Telecommunications-related introductions in 1997]]
[[Category:Audiovisual introductions in 1997]]




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