There are two licensing models for HarePoint Password Change for SharePoint:

Server-based licensing - In this case the object of licensing is Web Front End server (WFE). You need to license all WFEs in your environment. The number of users is unlimited with this model.

User-based licensing - This model allows you to license the software based on the number of SharePoint users - you can purchase as many licenses as many users you have. A SharePoint user, is a user authorized in some way on the SharePoint server. The number of user licenses should be equal to the number of authorized users who have access to the SharePoint portal. The minimum number of user licenses is 50 in this licensing model.