Does the unlocked one require a code to activate? If not, how does this prevent people from distributing the unlocked DMG?
If you read the site and the threads you'll know the answer.
Yes it requires a code and to register you enter your email address and username that you registered that code with to unlock it.
It then transmits your personal data stored on your mac to Codeweavers to store so that if you distribute it, they'll hunt you down and castrate you.
Ok I exaggerated about the castrate part.