Ehm..it is for PUTING YOUR MODELS IN YOUR FAVOURITE GAMES, by that they dont mean YOUR games that YOU`we made, and i have proof, think a little, why would they give a free version that is very good, better then many $100 eaven $200 3d modeling apps ?
http://www.turbosquid.com/Forum/Index.cfm/stgAct/PostList/intThreadID/20152
I cant find the thread where a guy from descreet explained it clearly.. but think a little, why havent they put any other format except for a renderer ?
And you should of copyed a bit more, and see that it enables you to make models for quake and such games, NOT FOR YOUR OWN GAMES !