Most STBs have to be registered to the ntl network or they won't receive and decode the signal properly, especially any add ons such as pay per view. The card in each STB (that often cooks quite nicely), is coded to the STB too and it's that in combination with the STB chips that give ntl some security.
No doubt there are hacks to get round all this, but as that would be illegal, were no even going to go there.
BTW
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