DRM is still a major problem in the online music and video industry. I hate DRM, and I’m sure 99% of the people reading this agree with me - DRM sucks. The only benefit is for the record companies, so that their music cannot be shared on file sharing/BitTorrent websites. It brings the user absolutely no benefits, and many drawbacks - including limiting what you can do with your music/video in almost every way possible. Whether it’s putting the file on your mobile phone, or wanting to use it on more than five computers.
When you legally download music from services such as iTunes and Musicmatch Jukebox, the files are protected by Digital Rights Management (DRM). This prevents you from playing the music on unsupported players. I use MelodyCan software (
http://www.melodycan.com/index.php) to remove protection. But remember distributing these files is illegal.