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Adobe Acrobat Reader PDF Error: "At least one signature is invalid."
If you are the recipient of a PDF that was signed using a UTD-issued certificate, you will need to "trust" UTD's main certificate (the one all individual UTD certificates are validated against) in Adobe.
Changing Your Signature in Adobe Acrobat
This article can be used when attempting to edit how a user's digital signature will appear in Adobe Acrobat.
Digital Signature on Adobe Acrobat Reader
The article shows how to use your digital certificate to sign a PDF in Adobe Acrobat Reader.