Guys, you are so wrong if you think that Steam games aren't protected.
Some games have SecuROM and "Steam Stub Protection" and most of them have only "Steam Stub Protection" - yeah, yeah - you heard right!!!!
Steam is protecting their games, so if you think you're buying original game code - you're wrong.
Just throw a Steam executable in IDA (Interactive DisAssembler by Ilfak Guilfanov) and EXE Protection ID.
TADA: SURPRISE!!! ))) This is why i deleted my account from Steam. I said to them - NO MORE F*CKING MONEY FOR DRMs. ONLY ORIGINAL CODE.