How do I generate a one-time registration key?

[Eveniunset]

I want to generate some keys that can only be used once, and cannot be reused.

[Enigma]

Hi, maybe you could explain your idea more detailed?

If you know how Enigma Protector generate keys, you would understand that the logic of "one-time" keys can't be applied there. There is no sense in "one-time" keys logic.

But if talking about Online Activation Panel, the activation keys could be used as a one time key, to activate program on one computer and no more: https://enigmaprotector.com/en/aboutoap.html

So please provide me more details, to give you better advice.