I remember reading years ago ....if you've a TV CAPABLE of recieving a signal, you need a licence. People tried getting away with it years ago by saying they only watched videoes. It wasnt acceptable, you had apparatus capable of recieving a signal, you need a licence, period.
So IF the same rule applies, whether its a live signal or not, catchup, DVD watching, etc...you'd still need a licence. IF the ruling still the same.
I remember it was explained as follows...what people were doing was unplugging the co-ax if they got a visit from the detector vans...'no chief, we dont watch TV, its only for viewing videos, so i dont need a licence'
It got short shrift from the authorities.
That is 25 year old info mind...i dont know whether anything fundamentally changed.