I think BBC iPlayer uses torrents internally to deliver its programmes. There's DRM, but it's not very restrictive. I throw my money at them once a year.
Well twice-ish as you pay them once via the Exchequer and once via TV Licensing.
How is their DRM "not very restrictive" unless you mean you can download DRM free if you can afford an iPhone (I think that's still true?). You can watch shows for 1 week before they're locked, can't you.
But yes last time I used it they installed a hidden application called Kontiki that there's practically no control over that leeches bandwidth without asking.