Heh!
After 28 days, you won't be able to play it! Unless you remove the digital rights management (DRM) - which also prevents you from copying it to a disc so you can watch it on anything other than the computer you downloaded it on to...
Something like FairUse4DRM or FairUse4WM should do it!
Or so I'm told. ;)
Not that I'd condone it, of course!
I used to use the iPlayer, but gave up as I don't want to watch things on my PC...
G x