A ton of people are having these problems. Check out the Atari message boards, you'll see what I mean.
I see one thread, I have already replied to it. If it happens again I'll just call Atari tech support. Useless, but, oh well.
No it isn't. It's unlikely, but definitely not impossible.
You guys know how CD keys for UT2k3/4 work, right? No? Okay, here we go.
There are 20 characters in that key. Given only those 20 different characters, there are 20! (20 factorial) combinations, or 2.43290200818e18 different possible CD keys.
With 6 billion people on the earth clicking away at a CD key generator, each one would have to produce 405483668 keys for that giant number to be reached. At one key being generated per second, it would take 12 years for one person to generate their 405483668 keys, and then try them to see if any of them work.
Once you take into account the fact that the UT Master Server only accepts a small (miniscule, actually) number of these keys as valid, you can see that it is pretty much impossible for a key generator to spit out my key.
What I didn't take into account here was the fact that there are 26 letters in the alphabet, but only 20 of them were used in my example. Want to do some more math? Okay...
6.32554522126e19 possible keys
Out of 6 billion people, each one would have to come up with 10542575369 keys.
At one key per second, this would take 334.3 years.
Assuming I screwed up my math in the last part (I probably did, I'm an idiot) there is still only a 1 in 2.43290200818e18 chance that a keygen would spit out my key. Assuming it only worked on those 20 characters. Assuming a bug in the keygen's code didn't prevent it from displaying certain combinations.
If someone really does manage to generate my key, then that means I just blew the biggest luck roll in my life.