It often disables the internal checks that verify if the server is in "Per User" or "Per Device" licensing mode. Risks of Using Patched Termsrv.dll
Understanding the Termsrv.dll Patch for Windows Server 2019 Windows Server 2019 is a powerful operating system designed to handle robust enterprise workloads. However, its default Remote Desktop Services (RDS) configuration limits concurrent connections. For small businesses, testing environments, or home labs, purchasing expensive Remote Desktop Services Client Access Licenses (RDS CALs) may not be feasible.
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: Allows one user to log in while another is already active without forcing a logout.