How can I secure my paid plugins?

I am developing some paid plugins for aaPanel. So now my question is, How can I secure it from unauthorised users?

Hello, the third-party plug-in for the panel does not support payment for the time being.

aaPanel_Kern I don't want payment system, I want to apply licence system. Is any way to achieve this?

If you are not sure about this, it is recommended that you consult the relevant provider of the license application system.