While it often targets pirated software, legitimate users can also encounter this due to technical glitches:

: Unlicensed copies often lack stability, leading to crashes at critical moments and potential corruption of .dwg files.

: The system has identified that the software was not manufactured by Autodesk or uses a known compromised serial number.

How to Resolve “Your Subscription Has Expired” Error - Autodesk

: Local license cache files or the FLEXnet folder may be damaged, preventing proper validation.