HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod
Per‑user CALs are tracked here too, but actual usage is stored in Active Directory or a database file ( edb*.log in %SystemRoot%\System32\LServer ). rds cal license registry key
There are several critical registry keys used to manage RDS Client Access Licenses (CALs), depending on whether you are defining the licensing mode, specifying a license server, or managing the grace period. Registry Path Value Name specifying a license server
LicenseServers (String) — The FQDN of your license server. Local/Manual Configuration: rds cal license registry key