License scheme, spoof-safe and revoke capabilities?

First, you should make it clear what you're trying to protect. Apparently, you want to ensure that for each purchase of your application, there will only ever be one computer on which the application is installed and runnable.

Let the registration code also be the activation code.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.