Searching for "free" RDS product keys online often leads to cracked software or "Keygens." Using these in a production environment carries massive risks:
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. rds cal license registry key free