ITunes and Social DRM
iTunes DRM free is not entirely DRM free. iTunes free downloads have what is called social DRM. Inside the audio file is your email address and account information which means if a song is shared, the person who shared the information is encoded into the file itself. I think this is a great idea and would love for publishers to go this route.
It doesn’t prevent a consumer from portability and ownership of a digital item, but it does carry with it accountability for sharing.