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Originally Posted by ianathuth
As far as I see it, Sky have a relatively small number of channels of their own, an EPG that makes viewing of all the channels that subscribe to it easy and a digibox sale, repair and installation service. They rely on other companies to provide the bulk of the channels available on their EPG. They rely on other companies to provide the satellites that carry the channels and on other companies, noticeably NTL, to provide the uplink to those satellites and other broadcasting services.
AFAIK anyone can can perform all of the things that Sky does without Sky being involved at all other than to allow its own channels to be received. This puts Sky in a different position to BT as BT own the last mile which is needed for ADSL reception. Sky do not own anything that is essential to provide a satellite reception service.
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But sky do make it exceptionally difficult to carry their channels, and if you were to attempt to set up a rival sat tv based service I'm pretty sure that they would make life incredibly difficult for you. NTL even charged separately for Sky One until a few years ago.