Have you seen those .wmv files that won't play the movie without the DRM working?
You download 1.3MB and waste your life getting a worthless file. It could be less than 1K to do whatever they want this to do (basicly pointing to some DRM web site).
The insides of the file say "instantdrm.com" and others, and good old microsoft makes .wmv files so that they call the instantdrm site to get the "real" file to show you, if you pay that is.
So bolck wmv files and let your buddies all know to share using mpg format so that this can't happen.
Block those drm files!
Ask your favorite client programmer to install a block for those file types!