Well, the solution is simple. One only has to change one's own ID or lend one that's used by some of the bombastic ArmA pro-ban community members. Just like people who wanted to be anonymous or were disliked by the admins did in OFP.
The CD-key algo is broken. It's possible that every ID has its own CD-key (or at least that it's possible to generate one after a few tries). So theoretically one should be able to convert IDs to CD-keys.