Well since people are wanting dirty bombs keys, Ill show you how you can se one.. I just tested it and it works
0. sign up for a nexon account (or use the one you already have) and sign up for the beta of db
1. download the file, extract it, and open the html
2. change the first key to a random key of your own or you can stick with the key given... (just make one up)
3. now screen shot it like this (make it show that it doesn't show the second 2 codes)
4. go contact nexon and say something like " I got invited to the beta, and I was looking forward to play but when I enter the key, it said invalid. I can't use the other 2 because I've already given them to my friends" and what not...
5. add the image as attachment and send
then if successful, they'll reply something like this they key is YMXF78G6S3BLMVDS if you want it), and WOLAH you have the beta... this should work with every other games... as long as you got the proof that you're "invited" to the game...