Oh, if it appears in WMP, it could be DirectShow related - try installing something over it instead - like ffdshow, and enable WMV rendering through ffdshow instead.

As for DRM removal, I believe there are some apps, but...  if they don't work, I can't really help you (with video).  Typically, DRM protected music can have DRM removed by simply burning an audio CD, then re-ripping it.  Dunno if you can burn the DRM'd video onto DVD or something...
You should always avoid DRM when possible...