Get Autodesk Inventor and Autocad serial nubers from windows.

Inventor Serial numbers  
C:\ProgramData\Autodesk\AdLM\*_USRegInfo.html
HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\Inventor\RegistryVersionX.Y\System\License

 AutoCAD serial numbers 
List the value of the *_PKSER variable (enter as a command on the AutoCAD commandline)
Use command ABOUT to display product information window
List the Registry key SerialNumber in a Registry hive corresponding to your application - e.g.: HKLM\SOFTWARE\Autodesk\AutoCAD\R17.2\ACAD-7001:409