Editing Digibox (section)

==Card pairing==
All Sky boxes, whether Digiboxes, Sky+ or SkyHD incorporate card pairing. This involves the 'marrying' or 'pairing' of a viewing card to one particular STB, thus preventing one card (and indeed subscription) being used on multiple digiboxes. During installation the engineer will initiate a 'callback' from the STB to Sky via modem and telephone line, transmitting details of the viewing card number and the box in which it is installed. Once this step has been completed it is no longer possible to view premium channels such as Movies or Sports on any other box besides that which the card was paired with. The card can still be used to view non-premium channels such as [[Sky1]] but will display an error message when attempting to watch a movie channel or sports channel with an unpaired box and card combination. A card can be 're-paired' in some instances such as STB replacement or multiroom relocation, however this must be initiated by Sky and cannot be completed by an end-user.