A custom program file, whether digitally signed or not, can be loaded using the same
techniques, but there are some additional considerations you might want to consider
when deploying a digitally signed file.

When loading a custom program file that has been digitally signed, the AutoCAD-based
program verifies the digital signature attached to the file. A message box is displayed,
whether the digital signature could be verified, that allows the user to load or not
load the program file into the drawing environment.

The following outlines the conditions that affect the information displayed in the
message box upon the loading of a custom program file.

Digital signature verified and the file hasn’t been changed

Recommendation: File should be safe to load, but you will want to verify the source of the file if
it is being loaded the first time.

Solution: Load and use the file as expected. Optionally, trust the publisher to avoid the message
box in the future for all files signed by the publisher.

Digital signature couldn’t be verified

A digital signature can’t be verified for the following reasons:

• File isn’t signed or was incorrectly signed
• File is signed, but the digital certificate to validate against isn’t installed in
  the ‘Trusted Root Certification Authorities’ store

Recommendation: Verify the source of the file and that the digital certificate used to sign the file
has been installed.

Solution: Install the digital certificate used to sign the file into the ‘Trusted Root Certification
Authorities’ store. See “To Import a Digital Certificate” for information on how to
install the digital certificate, if you or your company made the certificate.

Digital signature is invalid as a result of the file being changed after it was signed

Recommendation: Don’t load the file.

Solution: Obtain a version of the file that has been verified and signed. See “About Digitally
Signing Custom Program Files” for information on digitally signing a file.

Learning AutoCad

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