You'd think a demo would be free of DRM, but I have seen it (reportedly to prevent the possibility of an exploit being found that could allow someone to use the demo to play the full game). I installed the demo for Psychonauts, but got busy and didn't get to try it for awhile, then forgot about it. About 32 days later I remembered it, only to find there was a 30 day limit on the demo; if I didn't have access to another system to try the demo on I never would have bought a couple copies of the game (one for a gift).
