Password Reset Server is licensed per named user assigned with permission to reset their Active Directory password.
You should purchase one license per user, and you can purchase licenses at any time here. Once you’ve purchased them, simply add the new license to your Password Reset Server and use them immediately.
A user can be excluded at any time, but still remain on record for auditing purposes. This allows you to maintain an accurate audit history in your system even after employees have left the company. Excluded users don’t count towards the license count.
A Password Reset Server user license allows you to have one active user account on one server instance.