I had composed an answere before I had cut it out. Here you go.
-Nick- wrote:So the CD-key generates a GUID which is authenticated by the CD-key[...]
Yes. Without a valid CD-Key the game will not generate a valid GUID. And without that the EpicMasterServer wouldn't let you connect.
[...]and vise versa? Like a two-step verification?
No. You can't (with an aceptable among of time and work) recreate a CD-Key from a GUID. Imagine the CD-Key as 20 single salt cristals.. you throw them in a glas off salt water and the pruduct is your GUID. Now try to find exact the 20 salt cristals which you trowed in. It's very hard or?
The GUID is like a Nickname.. no one knows your real name (CD-Key). Until you get a spy (trojan) in your house, or let them read your private files. Btw. all this cool online verification things like steam are doing that.. Blizzard is the king in such things and will ban your hardware if they want.
What I mean with "only epic can that" was that without a valied CD-Key you can't connect to the masterserver and will not be able to play online. There are two differend things what was in that topic. First a maybe build in CD-key, jump over the internal validation, and so on in a file which would mean it is cracked. That is clearly not allowed.
The second thing was the offer from unused Keys. So that keys schould be valied because if not they are useles. What you can't proof is if the keys are warezed which is also not allowed.
But I just assume that they are clean as he said. Just because he is smart enough to know that if not that would be a crime. Regardless if someone cares or not.
A programm simply becomes warezed if you install your own copie on an other persons PC and you both use it. And it dosn't matter if you need a key or not thats simply for all software (every programm, e-book, musik, whatever) which is not free to use bye the rights owner. I personaly would also go so far that if you have a thing like "amazon prime" and gave an other person your paswort to whatch videos it is also warezed.. and if you buy an e-book, read it on a reader and hand it over to an other person.. just because it's digital. You see prety easy to get in jail? Till 5 years in germany.. for violence or robery the punishments are not so hard.. poor system..

Btw. it is also vorbidden to post a link to a Burningprogramm which is made for savety copies.. you are allowed to name it but not to post a link to it.. very easy to go on the "black side" when it comes to copieright for digital things in germany. On the other hand our gouverment seems to be allowed to buy stolen information (tax evader CD).. they make the laws how it fits for them and there "partners" best. Uhh.. bad topic and has nothing to do with the original one.
However I fully agree with Cat that things which are going on in private are private and dosen't belong to the forum admins.
Btw. should we not move that topic to the "off topic" forum? It is more general than UT2004 related. Also when it was the starting point.