I just downloaded the MP3 converter so I could convert my WMA audio files to MP3. Every time I try to add a file to convert, I get a prompt saying it can't add the file and asks is my WMA file DRM protected. Well, I don't know what DRM is. This is frustrating. Can anyone hellp me with this?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic