What is the normal licensing system?

Question

Programming

I develop small computer programs.
I write in different languages, such as C, Delphi, python, etc. Depending on the task. There was a problem: It is
necessary to protect the software with a license key.
The licensing procedure is as follows:
I have, say, 10 keys that I will distribute to all project participants. I need a system on the server with which I can manage licenses. Those. see which are activated, which are not yet. Delete and add new ones. It is also desirable that there be several users (my partner and I). I understand that it is a very specific task, which is ideally ordered, but perhaps there are already tested solutions that will allow you to insert a small check into the program code, and manage it on the server through a ready-made CRM