RDS CALs are not the same as Windows CALs for users or devices. If you want to provide multiple remote desktop sessions for your Windows Server 2019, you need to buy Remote Desktop Services (RDS) CALs. Remote Desktop Protocol (RDP) is used to provide access to remote desktop services on the server for remote users. The number of client access licenses needed depends on the number of users or devices that will be connected to a server. The number of server licenses needed depends on the number of processors and processor cores. There are two types of licenses for Windows Server 2019 – server licenses and client access licenses (CALs). The licensing scheme of Windows Server 2019 is similar to Windows Server 2016. This blog post covers Windows Server licensing (including Microsoft virtualized server licensing) to help you estimate Windows Server cost for a physical server and virtual machines. Customers are confused with the new licensing model when trying to estimate Windows server licensing costs and buy the correct license. Windows Server licensing became more complicated with the release of Windows Server 2016 (compared to Windows Server 2012). Windows Server 2019 is an operating system that is widely used on physical servers and virtual machines including Microsoft virtualized servers in organizations.

By Michael Bose The Essentials of Windows Server Licensing for Virtual Machines

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