How does your license system work?
The license system of PHPKB knowledge base software is based on the number of required admin users. An admin user account is a user that would be able to login to the admin area, create/manage articles, and be an admin, author or editor. They include Writers (Authors), Editors and Superusers. The license restriction is only on the number of admin user accounts that can be created to login and update your knowledge base. These are the users who must be licensed. For example you can have 1,000 users with a PHPKB account, but if only 15 of them have the privilege to log in to the admin area, then you have 15 admin users, and your license only needs to cover them.