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For the first 2 years after launch, the service was branded Sky HD.The service requires the user to have a Sky HD Digibox and an HD ready TV.In January 2010, customers started being offered the Sky HD box as standard, with the HD package being optional at the same subscription price.The Sky box was subsequently withdrawn, meaning the Sky HD became part of a standard installation.All HD channels are broadcast in 1080i format (though the box can be set to scale this to 720p if the user wishes), using the H.264/MPEG-4 AVC compression standard, from Astra 2A, Astra 2E, Astra 2F and Eutelsat 28A satellites at 28.2°E and 28.5°E in a new DVB transmission standard, DVB-S2.BBC HD was initially broadcast using DVB-S but switched to DVB-S2 on 6 June 2011.
Sky boxes manufactured prior to January 2008 also had analogue component connections (YPb Pr), but as the HDCP copy protection cannot be applied to this type of output it is no longer included.
These have included Sky News (Technofile, Diana: The Last Word), Disney Channel (High School Musical 2) and Nickelodeon (i Carly).
The first generation of Sky HD Digibox were produced by Thomson, with Sky subsequently adding Samsung, Pace and Amstrad as manufacturers afterwards.
These can be switched off if viewers want to improve basic legibility.
Sky HD is the brand name of the HDTV service launched by Sky plc on in the United Kingdom and Ireland to enable high definition channels on Sky to be viewed.