As John Carmack supports the open-source community, he released the source code (not the game assets) into the wild as an open source project. I myself have downloaded, compiled, and played the game using this code and it works well. There is even integrated support for the original version of the Rift inside. While he was unable to release all of the code for the game due to patent issues (lookup Carmack's Reverse), the game is completely playable on homemade Rift units at this time. Once Oculus releases the offical SDK for the Rift, it will be a short time before I or another member of the open-source community takes care of the problem. Just lookup a fork on GitHub called Doom-3-BFG-VR and I will be there doing anything I can to help.
Please, to anyone planning on playing Doom 3 like this, purchase the game and copy the assets rather than finding nefarious ways of finding them. Support awesomeness such as id Software and its remaining founder.
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Big shout out to John Carmack for the foresight to allow gamers the ability to again enjoy a game which is otherwise, past its prime. For the record, Quake 3 has also been released as well so expect to see MANY mods for both franchises very shortly and again, thank you Mr. Carmack.

IMPLICIT permission. guppies.

011000110110110001100101011101100110010101110010 01100111011010010111001001101100 anyways?

An ex that wants to know what you've been up to, your grocery mega-mart so they can sell you want you don't know you need yet, that fellow on the phone with a funny accent (anyone smell vodka) who says he's from your credit card company and know's you're on vacation pumping gas in your pretty, new GM vehicle so he must be for real but is now asking your pin number so he can prove he's speaking to the right person, your dear old uncle Sam who just wants to check up on you, or your boss who swears that he saw you at the club but can't say anything because he shouldn't have been there either and while he now has proof of where you were, is driving the '12 model with newly activated service.
But hey, I'm outraged that they are going to track me only when I discontinue service. They shouldn't have told me this because now it's gonna take a senator or three, several committees, and many hours of CSPAN to make me feel better that they are only tracking me always, and only with my knowledge and permission. Poor poor guppies.

People's cowardness, or their stupidity...

Wow, they are tracking people after they cancel they cancel the service. I couldn't be more furious. This is an outrage! Say... I wonder if people are even aware they everything they do is being tracked by somebody else, uploaded through the air freely with an encryption that may or may not yet have been broken and if if not, is being stored "securely" until another party wants to buy the harmless "sanitized" data. Damn guppies, cell phones are bad enough but now people are driving in a machine that is constantly spewing everything you do and see for the whole world to know, that is if they haven't already uploaded it themselves to Facebook or tweeted it to a bunch or people who really don't care about what they are doing except that one lone friend who isn't a real friend at all, or a person for that matter. Just another machine aggregating data for whomever has the money for these harmless bits of ones and zeros.