Yes you may be getting music DRM free but that has not stopped Apple from stamping inside the song file the user's full name and account email embedded in them.

So if your dumb enough to drop the file on a P2P sharing site you may get a nice notice from the RIAA. Which brings up a major concern. What happens if your computer gets hacked or your kids sneaker net some of your music over to a friends house.

I am going to be that within a day or two their will be a utility that strips that data out of the file.