How do i know if my mp3's are copyright protected (DRM)?

A professional protected music converter, help users remove DRM from music (audio and video files) that bought from iTunes, Windows, etc. on Windows NT4/2000/2003/XP and Windows Vista.a href="http://www.drm-remove.com/music-converter.html" rel="nofollow"http://www.drm-remove.com/music-converte…/a