I have a Skybox F5S at the holiday house and I can plug the sky card into this and it unscrambles nearly all of the channels.  .. 

Except for , comedy channel and the new Zone channel (scifi i think). When I switch to these channels the box sometimes says 'scrambled'. 

Although, not all the time, sometimes the comedy channel works OK.  Sometimes when one show is working ok but ends then the next show starts  and the box will switch to 'scrambled' again. It is like Sky can set differing decryption for different shows within the same channel. 

Any ideas? I'm guessing this is probably not easy to solve since few people have these boxes and maybe not this problem. 

I get the ones I want anyway, just curious about the tech in play.