But the larger issue is, if Microsoft Windows is able to grab DRMed content, there is some path to grab DRMed content at all. Which means that if someone with lots of time, passion and talent on their hand might be able to exploit that path to get more then just a screenshot without audio every 0.2 fps.
The promise of DRMed content at the moment is that (technically) no one is able to do so as there are no backdoors into it, for nobody.
There is always a path to grab it, because something on the device has to have it in order to display it on the screen.