The key is FAKE , lol.
FAKE FAKE FAKE FAKE FAKE FAKE FAKE FAKE FAKE FAKE
get it ? Fake , it's fucking Fake. NP
Edit Yeah sorry rushed a bit there , what is happenig to you my firend is that you Recived not a CD-Key but a HEX-Key.
Simple i'll explain what to do
press [Windows Key] + R
and type regedit
go to this directory:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Bohemia Interactive Studio\ArmA 2 OA
and then double click on the KEY registry thing
and remove everything in there, and put in the code