amok: That's the acronym. Now define how it works. Feel free to use Wikpedia if you struggle
waltc: There is no single "how it works"...please, you can do better. There are multiple forms of DRM, from copy protection to manual codes to code wheels to Steamworks DRM--the sky is the limit. I guess we will have to agree to disagree on this. He locks down the game, he locks down the forum, ergo it's all a form of DRM applied to the same game. Sorry that you refuse to see what I'm saying--I think it's very clear.
No, it is not clear at all, and this is why many times, the DRM free people sometimes well... gets laughed at and not taken serious. Restricting access on forum is not DRM at all, if it is then everything done online is DRM, including using this forum, as you need and account to do so, and you can get banned and locked out. Not to mention search engine results, firewalls, ISP protocols and so on. Basically, the whole internet is then DRM, which just makes the term ridiculous and completely meaningless.
DRM is about the control of a software and the licenses you buy, that's it, nothing else, it has not. DRM are technologies that try to "control the use, modification, and distribution of copyrighted works" - that's it. nothing more or less