Security Concern: Invalid Certificate

Executable files that are loaded into AutoCAD can include a security certificate to guard against malware.

To protect you against these potential malware threats, the Invalid Certificate warning message appears when either of these conditions are met:

• The executable file has been intentionally altered or secretly tampered with.
• The trusted Certification Authority has revoked the certificate.

If this is an AutoLISP file that you modified intentionally, you can remove the certification block at the end of the file. We recommend that you obtain a new certification for this executable file.