Is there a good (preferably free) software for removing DRM from Windows video files or something that will allow conversion to play those files on a Mac?
I have been using Audials for quite some time to remove drm protection from audio and video files. You can give it a try, it is not free but they have a demo version you can try out and I can tell you from experience that the software does not let down.
There are some tutorials on how to remove drm on their website, if you wanna take a look:
there are several good free software apps that can do the job, see //www.makeuseof.com/pages/best-windows-software#cdtools
this is technically illegal unless you use the loopholes of law.
the genreal idea is
first burn it ona disc
and then rip it
but first use a converter like format factoy.if converted format works for you, you can skip this long process.
guides on this :
using record option of vlc player :
How To Free Your Music From The DRM Copy Protection