Video won't play or convert

Hi all,

I ripped a video off a tv channels 'catch up' service and it ripped perfectly with a piece of software I have, it's a large file too (over 1gb - it was a long show) but now I cannot get the ripped video to play or convert to anything in any piece of software I have. There may be DRM on it, I am snot sure.

can anyone give me any advice on how I might be able to remove the restriction on the ripped file and convert it to something watchable?

Thank you.