That's wrong. Please stop using terms you don't understand. Limiting installations is only one facet of DRM. DRM is as simple as copy protection for executables. DRM is as simple as an online server you need to authenticate with before you can play the game. You're basically saying Sim City was DRM free, and so is every Steam game, pretty much every game is DRM free except those that limit your installs (of which I can only name Spore and I think that limit was removed).
You're just wrong.
http://en.m.wikipedia.org/wiki/Digital_rights_management
I hate linking wikipedia. But the definition of DRM is available in many other locations.
You are not correct. You might think you are. But server authentication has been around for years and predates DRM by several if those years.
ED is DRM free by definition.
Steam is DRM free. I've installed it on more computers than I can count.
DRM is controversial because it is aggressive in piracy prevention. Requiring an internet connection to access content, even on an account system, is not DRM.