BitTorrent problem...?

Im using this Bit Torrent 6.0 Beta. I was able to completely downloaded 1 music video and still downloading other movies and videos with the Mininova ( as my source). The problem is when im trying to play the video I was completely downloaded, it will not play, it`s giving a message " This file is under Digital Rights Management (DRM) protection and can not be played"...Please help me solve this problem...Thanks