Thanks for the info Unclown. We have had a few instances of people asking for others CD keys over xfire lately.
NEVER give out your CD hash to anyone, even people you know. This is your personal ID number for Halo and once someone else uses it and gets banned, you both will be banned from our servers. Anyone who wants your CD number is only up to no good and will soon be getting into trouble with it.
We really need to ask ourselves why anyone would ask for numbers when they are already in one of our servers...