How to erase the product key in Java?

Hello Sir,If I use TurboActivate.Deactivate(true); the product key is erased and the users can enter the new key.But if I want to erase the key without Deactivate method what is the procedure? What method should I use?

But if I want to erase the key without Deactivate method what is the procedure?

You can't. They have to deactivate the old product key before activating a new one. So deactivation is a required step. (You can deactivate offline if that's what you want).