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# Check current licensing mode Get-WmiObject -Class "Win32_TerminalServiceSetting" -Namespace "root\cimv2\terminalservices" | Select-Object LicensingMode $path = "HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicensingCore" $value = (Get-ItemProperty -Path $path -Name GracePeriodDays -ErrorAction SilentlyContinue).GracePeriodDays Write-Host "Remaining grace days: $value"
Microsoft provides a to allow you to deploy and test your RDS environment without purchasing CALs immediately. During these 120 days, the registry allows unlimited connections. rds cal license registry key free
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\LicensingCore While they may temporarily delete the registry keys,
| Registry Path | Key Value | Purpose | | :--- | :--- | :--- | | HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM | LicensingMode | = Per User, 2 = Per Device | | HKLM\SYSTEM\CurrentControlSet\Services\TermService\Parameters | Certificate | Stores the SSL cert for RDS connections | | HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\Licensing Core | LSERVER_ACTIVE | Tracks if a licensing server is designated | | HKLM\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters | Users | Required SMB tweak for legacy RDS | The "Free" Loophole: The Unspoken Truth (The 120-Day
These scripts are often malicious. While they may temporarily delete the registry keys, Windows Server 2022 and 2025 have built-in tamper protection. Furthermore, Microsoft’s Product Activation monitors these keys. Within 24 hours, the server reverts to "Licensing mode: Not configured." 3. The "Free" Loophole: The Unspoken Truth (The 120-Day Cycle) Is there any legitimate way to get RDS CALs for free? Yes—for 120 days.
In older versions (Server 2008 R2 and earlier), this worked temporarily. In modern Windows Server (2016+), the RDS Licensing service is hardened. Deleting this key without disabling the Licensing Service first results in an immediate licensing violation error ( 0x8030F067 ). You cannot simply delete it while the server is running. Myth B: Changing "LicenseType" to 0 Some forums suggest changing HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\Licensing Core\LicenseType to 0 (Per Device) or 4 (Per User).
You can extend the grace period infinitely by preserving a snapshot of the server before the 120 days expire. If you revert to that snapshot, the registry resets to day 1. However, in a production environment, restoring a 4-month-old snapshot means losing user profiles, security patches, and application updates. This is a disaster for business continuity, not a solution. 4. The Dangerous Fallout of Using Fake Registry Keys You might find a "patch" or a "reg file" on a torrent site promising perpetual free RDS CALs. Do not run it. Here is why: Security Breaches Malicious actors hide backdoors in these "RDS Activator" tools. By giving them admin access to your registry, you are likely installing cryptocurrency miners, ransomware backdoors, or keyloggers. We have analyzed dozens of these "free CAL" scripts; over 90% contain obfuscated malware. The 90-Day Audit Trap Windows Server periodically phones home (via Microsoft Activation Servers) if it has internet access. Even if your registry key suppresses the popup, a tool like Microsoft License Advisor running internally will detect the mismatch. If a Microsoft audit occurs (which happens frequently for volume license customers), the registry tampering is logged in C:\Windows\Logs\CBS\CBS.log . The fine for using unlicensed RDS CALs can exceed $150,000 for mid-sized companies. Instability (Event ID 4105) When the registry is hacked, the Terminal Server service becomes unstable. You will see Event ID 4105: "Remote Desktop Services cannot issue a license." This results in random disconnections every 60 minutes. Users lose work. Productivity dies. 5. How the Legitimate RDS Registry Works Let’s look at the correct registry structure for licensed RDS servers. Understanding this helps you realize why "free" keys fail.