Windows Server 2019 - CAL
A license that gives a user the right to access the services of the server.
Windows Server is a line of operating systems that is specifically created for use on a server.
CSP Perpetual Program - A single, upfront payment is made for perpetual ownership of the license. No Software Assurance is available to purchase, and no SA benefits are included as part of the license rights. All use rights are detailed in the Product Terms document.