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A card is included with installation or can be purchased direct from Sky. For security reasons [3] the viewing cards are deactivated from time to time and reception of the encrypted free-to-view channels disabled. This requires the user to purchase a new viewing card at the current standard charge.
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.
Conditional Access Module Various types of CAM. A conditional access module (CAM) is an electronic device, usually incorporating a slot for a smart card, which equips an integrated digital television or set-top box with the appropriate hardware facility to view conditional access content that has been encrypted using a conditional access system. [1]
The series of cutpoints is determined by a pseudo-random sequence. Channels were decoded using a pseudorandom number generator (PRNG) sequence stored on a smart card (aka Viewing Card). To decode a channel the decoder would read the smart card to check if the card is authorised for the specific channel. If not, a message would appear on screen.
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An Amstrad Digibox with a Viewing Card inserted Sky Viewing Card. The Digibox is a device marketed by Sky UK in the UK and Ireland to enable home users to receive digital satellite television broadcasts (satellite receiver) from the Astra satellites at 28.2° east.
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All previous "Top Up TV Ready" set-top boxes with viewing card slots were later only able to receive ESPN. With the launch of Sky Sports in 2010, BSkyB insisted that the viewing smart card must be paired to the set-top box. Whilst Top Up TV Freeview+ DTR's have this facility using the CAN number, few other set-top boxes offered this facility ...