@Clarivaus,
As most everyone knows, sensible programs do not show the “Register” button or the “Buy Now” buttons after a program has been registered. If the registration expires at some point, then it makes sense to show them when that happens. So, why does a program need to “always” show the Register and Buy Now buttons? In hopes that it might cause you to think you have not registered or paid for a program. Some applications even remove the legally registered values as soon as you you click these buttons. In cases where there is a limited time to register the software, if you click on these types of buttons at some point after registration, you may lose your registration. Any time I see a program not show that a program is registered, and especially those that do not remove these buttons after registration, I start to wonder just how honest they are, and when there are alternatives, I generally lean towards recommending them instead.