Not a codec problem, a license problem:
quoted from iskysoft.com
Windows Media Video (WMV) was developed by Microsoft and these files are playable using Windows Media Player. There are numerous portable media players available which support
WMV playback. You can use a .WMV file for either streaming or downloading. Downloaded Windows Media Files come with the protection by the DRM License itself. If you try to play it for the first time on your PC, Windows Media Player will try and look for the license on the PC.
It's explicable that you would like to remove DRM from WMV files. You can play a windows media video file without obtaining a license from the digital rights management server. There are several ways of achieving this task of
removing of DRM from WMV.
1. freeme2 -
Browse FreeMe2 Files on SourceForge.net
2. automate unDRM -
Free DRM removal from .WMV, .ASF, .WMA (Windows Media audio/video files). Included in the download pack: drmdbg, drm2wmv, DecryptIt
You can
Download Automate unDRM here.
These are not written by me and the original article can be found here
How to Remove DRM from WMV
Hope I helped~!