Very true - we'd better not discuss all things Limewire-y and sneaky beaky uploady...that's a lot of "y" but I've had a lot of ginger biscuits today and I'm not altogether with it right now...
If the score is not for general release, then playing by ear is all you can try and do. Depending on your ability, it shouldn't be too difficult. Try going for the theme for the demon door areas - it's fairly simple and doesn't have too many accompaniments to filter through.
Failing that (I always play by ear because I suck at learning - too damn lazy to listen to other people, really) why not try searching YouTube for perhaps someone playing the score themselves and you could try and copy them? It's bound to be simplified that way and easier to pick up...