We have a sky box, vcr & dvd player shared over 6 TVs in the house aswell as extra sky boxes games consoles etc wired into the TVs.
Since the boxes etc are all in the lounge though u need to be in the lounge to change channel / play & pause / change dvd.
I just done ours with aerial TV wires n a couple booster box's
Dunno how the cable boxes differ but if they use aerial wires to connect to the TV then its not too hard a job to share the signal as long as your not bothered about changing channels from any of the extra TVs