Here is the problem, every DRM infection is unique, patented, copyrighted, copywronged, and DMCAd ad nauseum, They protect their code in every way possible, and make it so you have to get their approval to use it. This is all done under the guise of protecting content, but that is a lie. If you are going to steal content, do you think violating another copyright on the DRM mechanism will make you lose more sleep? Not a chance.
If you are a rival company though, you can't really violate such things and get away with it for long, Sony, MS and most people swiping GPLd code are proof of that. So, you have to license it to play ball, or at least play music and movies. That is the true nature of DRM infections, to keep other big greedy companies out.
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