License your RDS deployment with client access licenses (CALs)
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-client-access-license
Each user and device that connects to a Remote Desktop Session host needs a client access license (CAL). You use RD Licensing to install, issue, and track RDS … There are two types of RDS CALs:
Each user and device that connects to a Remote Desktop Session host needs a client access license (CAL). You use RD Licensing to install, issue, and track RDS …
There are two types of RDS CALs:
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