said by Linus Torvalds :
I want to make it clear that DRM is perfectly ok with Linux!
I do realize that a lot of people want to use the kernel in some way to just make DRM go away, at least as far as Linux is concerned. Either by some policy decision or by extending the GPL to just not allow it.
And like the software patent issue, I also don't necessarily like DRM myself, but I still ended up feeling the same: I'm an "Oppenheimer", and I refuse to play politics with Linux, and I think you can use Linux for whatever you want to - which very much includes things I don't necessarily personally approve of.
The GPL requires you to give out sources to the kernel, but it doesn't limit what you can _do_ with the kernel. On the whole, this is just another example of why rms calls me "just an engineer" and thinks I have no ideals.
[ Personally, I see it as a virtue - trying to make the world a slightly better place _without_ trying to impose your moral values on other people. You do whatever the h*ll rings your bell, I'm just an engineer who wants to make the best OS possible. ]
Btw, one thing that is clearly _not_ allowed by the GPL is hiding private keys in the binary. You can sign the binary that is a result of the build process, but you can _not_ make a binary that is aware of certain keys without making those keys public - because those keys will obviously have been part of the kernel build itself.