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Reverse Engineering
Videoguard is unusual in that legitimate external Conditional Access Modules are not available, the encryption system instead being built in to 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.
Sky Digital 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. The new cards will only be usable within an authorised BSkyB NDS receiver and will no longer work in the current Dreambox or other Linux based software CAMs.
References
^ "Copy of email from Channel Five viewer response". http://www.digitalspy.co.uk/forums/showpost.php?p=22363338&postcount=1. Retrieved 2009-01-17. 
^ "Five 'This Programme Is Unavailable On Freesat' screen". http://www.flickr.com/photos/freesathd/3002989164/. Retrieved 2009-01-17. 
^ ReadMe.txt from NDSCam ver.0.0.0.7
External links
NDS official website - technical and business information on VideoGuard
v  d  e
Broadcast encryption and digital rights management
Conditional access
CableCARD  Conditional access system  Renewable security
DVB
Common Interface  CI+  Common Scrambling Algorithm  Conditional access module  DVB-CI  DVB-CPCM  Syndication
Smart cards and encryption
BISS  Conax  Cryptoworks  Digicipher  Irdeto  KeyFly  Nagravision  NDS  VideoGuard  PowerVu  RAS  SECA Mediaguard  Viaccess   Wegener
DRM
Authorized domain  B-CAS  Broadcast flag  HDCP   Hardware restrictions
Data security
Card sharing  Card server  FTA  Pirate decryption
Analogue broadcast encoding
EuroCrypt  Videocipher  VideoCrypt
See also free to view and pay television
Categories: Digital television | Digital rights management | Conditional access systemHidden categories: Articles that may contain original research from January 2008



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