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AutoCAD 2002 relies on a third-party copy-protection system called , developed by C-Dilla. The system uses a specific dynamic link library file ( cdilla.dll ) alongside a background service to verify software licenses.
This is the most common cause today. AutoCAD 2002 was designed for Windows 2000 and XP. Attempting to run it on Windows 10 or 11 almost always triggers this error because the C‑Dilla license management system is incompatible with the newer OS security and architecture. One Autodesk Community post notes that “no one in the year 2001 was designing R2002 to work in Win10 12+ years later”. download cdilladll autocad 2002 exclusive