If you check the bottom of the box.... in the VERY VERY VERY small print, there are a short list of requirements..... the last one is an internet connection...
I own the original (i host lan parties... so that forces me to buy originals ALL the time...).... BUT after i bought the originals, i went out and bought a pirate copy, just so i can play it without having the hassles of STEAM...
STEAM is just too much a risk for me to run in a LAN game... since most people choose to disable antivirus, firewalls, packet scanners, etc, during the games (performance issues mostly), its just too dangerous to have an internet connection active at the same time.
So... they forced the good ol' hardworking folk, to go and buy pirated copies ASWELL, just to be able to play without any worries.
Aww well, at least the pirated copy was only R50. (8$), and it works harder than the originals (which is all still sealed, except for 1 <img src="/ubbthreads/images/graemlins/evilgrin1.gif" alt="" />