This was posted by Kallocain, Community Manager
Paradox Dev Team on the paradox forum
"The keys are given to you in a format other than what the registration on this forum expects. I am going to fix this asap, but until then, you can register by writing the columns in another order.
xxxx-xxxx-xxxx-xxxx-RPDX-xxxx
The RPDX column should be the first you enter, and then the rest. So if you have:
xxxx-xxxx-xxxx-xxxx-RPDX-xxxx, you would enter it like this:
RPDX-xxxx-xxxx-xxxx-xxxx-xxxx
The second last column is the one that should be first. It might say RPDX, it might say something similar, but it is always the second last. You could wait a little while and give me time to fix it too, and you'll be able to just type the key as it was given to you.
I'm sorry about the extra trouble, it will go away soon! "
I used it to get the little prussian flag
Does the serial key you enter into configuration utility anything or is it just neat way to remind you whats the serial key is ?