How to Reset the Windows Remote Desktop Services Licensing Grace Period

To reset the RDS licensing grace period, perform the following steps:

1. On the RDS session host, launch Registry Editor (regedit) as an administrator.
2. In regedit, browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod.
3. Within this registry key is a REG_BINARY entry whose name begins with the string L$RTMTIMEBOMB. (This is likely the only entry in this key.) The default permissions on this entry do not allow it to be modified or deleted, so these permissions must be changed
4. Right-click the GracePeriod folder in the left pane of regedit and select Permissions.
5. In the permissions window that appears, select Administrators, and assign this group Full Control permissions. Click OK to close the window.
6. Right-click the L$RTMTIMEBOMB… registry entry and select Delete. Click Yes to confirm the deletion.
7. Exit regedit.
8. Reboot the session host server in order for the registry change to take effect.