If you read the registry entry for AutoCAD under HKEY_LOCAL_MACHINE there is a SerialNumber key.
i.e.
HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R16.0\ACAD-201:409\SerialNumber
Let me guess, you're tying your software licencing scheme to the AutoCAD serial number.
Nope...
In fact I mange license for our cie..
but some of my workmate have formatted a laptop containing a standalone license.
but he forget to get the serial number before doing this.
The problem is:
By chance, He have made a Ghost of this laptop but it will take to much time to remake a ghost of this current laptop re-install the old one, see the serial and re-install the new ghost ....see ?
so whit the GHO file you can see all file without re-installing the ghost.....but you can not see the windows registry.