By the way, Quake, Quake 2 and Quake 3 can legitimately have source engines used with them by the way to get around CEG, if that's any help.
Assorted list of games confirmed to use CEG:
Orcs Must Die!, The Baconing, GTA: San Andreas, Xotic, Aliens versus Predator Classic 2000, And Yet It Moves, Darwinia, Indiana Jones and the Last Crusade, Gish, Indiana Jones and the Fate of Atlantis, Jolly Rover, NightSky, Loom, Sequence, Chime, Hammerfight, Beyond Good & Evil, The Dig, Dustforce, Freedom Force, Shatter, Mafia, all Half-Life games (surprise), Grand Theft Auto 3, Nikopol: Secrets of the Immortals, Mount&Blade, Morrowind, Penumbra (all of it), Poker Night at the Inventory, Gothic II, Puzzle Agent 2, Sam & Max (all of them), X-COM: Interceptor and Enforcer
All Zombies Must Die
Hacker Evolution Duality
Starts without steam running
If it connects to your account at all its DRM and not FREE of it. and STEAM is DRM no matter how you try to paint it. Securom at its worst. Connect to check if its your game every time you play even if its SP. How is that not SecuRom Like?