Read this IGN article.
http://pc.ign.com/articles/121/1213607p1.html
You have to hand it to CD Project. Even though 5 copies were pirated to one legitimate purchase, they still will not use intrusive DRM, unlike some publishers *cough* Ubisoft *cough*. This is really a Catch 22 for developers and publishers. If they use strict DRM, people will get angry, not buy the game, and pirate it. On the other, if they use relaxed DRM, pirates' eye will light up, seeing an easy target. The whole spectacle of the relaxed DRM on The Witcher 2 probably increased the number of pirated copies, but you get the point. And even though piracy is rampant, they're still focusing on PCs, whereas many devs are just throwing their hand up and going to consoles.
CD Project, Valve, Stardock, Creative Assembly...how many are left, anyway?