DRM refers to code which enforces (or attempts to enforce) license restrictions. So, by definition, writing code which attempts to enforce GPL compliance from k

DRM refers to code which enforces (or attempts to enforce) license restrictions. So, by definition, writing code which attempts to enforce GPL compliance from kernel modules is DRM. The GPL itself is just an idea. I can download GNU emacs, strip out any reference to freedom, and distribute that to others under my own proprietary license. I would be violating the license, obviously, and a court could prevent me from doing so, but nothing in Emacs itself would.