I find the terms & conditions of such things to be so long and drawn out that I just avoid the service; I'm not sure what the copyright situation is and I'm not prepared to seek legal advice. Last thing I want to do is assign unlimited use to a random advertising outfit.

That said, I'm not sure how enforceable these things are - last time I saw an upgrade on an iPad, it was 36 pages of contract. Not sure you can reasonably expect people to read all that.