Digital Restrictions (or Rights) Management is a set of locks on those music file that make it
impossible to play the music unless your computer has been provided the secret codes by the
company. People who make the mistake of signing up to BearShare 6, iTunes or any of those
other DRM-using services can have all or any of their music taken away without notice
whenever the control freaks who hold the codes decide to do it.

I prefer to download MP3 files because they don't support that nonsense. ;]