RDS CAL (Client Access License) registry keys are typically used to either configure licensing modes or reset the 120-day "grace period" for testing environments. While there is no "free" permanent license key, you can manage and extend your trial through the registry. Resetting the 120-Day RDS Grace Period
# Check current licensing mode
Get-WmiObject -Class "Win32_TerminalServiceSetting" -Namespace "root\cimv2\terminalservices" | Select-Object LicensingMode
Risks of Using Unauthorized RDS CAL License Registry Key rds cal license registry key free
isn't applying correctly, you can manually set the licensing mode (Per User or Per Device) in the registry. RDS CAL (Client Access License) registry keys are