Cloned/imaged 3040 reports error with Client Access License when RDP connection is started

I have created a disk image of a pre-configured Dell Wyse 3040 thin client and pushed that to some other, identical systems. This worked perfectly and allows for generating a stadardized and like 99% precofigured system within 10 minutes - but obviously the disk cloning does also clone the RDP "Client Access License", which is stored somewhere on the thinlinux system...  So while everything seems to work, one cannot make use of RDP...

The full error text shown right after starting a new RDP session is: "The Client Access License stored by the client has been modified."

When I googled for this error I came across a post which explained how to fix this problem on a Windows system, which is as simple as deleting the registry entry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSLicensing and to start over again.
But where could I find and delete this entry/key with the ThinLinux OS ?

Any help is appreciated very much!