Last week President Obama gave Queen Elizabeth II an iPod with 40 show tunes as a gift.
The Electronic Frontier Foundation pointed out that the President probably violated the iTunes terms of service as a result of giving her the gift. At the very least it is incredibly ambiguous.
I took a look at the terms of service for myself and they are absolutely correct that there seems to be no real answer about who owns the music after a user pays for it.
I recommend reading the original EFF post because it clearly explains the problems and ambiguity with our current intellectual property laws. Any attempt to improve upon their post would be a total waste of your time and mine.
This just goes to show you how ill-equipped our legal system is for present and future technology.