![]() ![]() Select OK to close all windows and finish the task.In the Import Contact Settings window which opens next, check the option "Use this certificate as a trusted root".Select OK in the first dialog box after reading the instructions displayed.In the window, navigate to the Trust tab and select Add to Trusted Certificates.PDF files may be optimized using Adobe Acrobat software or QPDF. The row should state "The University of Texas at Dallas RSA". Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by. Select the row above the one with a warning sign in the new window. ![]() To do that, expand a signature and then the Signature Details section by clicking the arrows adjacent to them.However, you need to validate only one signature to remove this error. You will be able to see all the signatures which are causing the issue.Then, click on the Signatures icon in the left-hand sidebar.Click the Signature Panel button in the banner where the error is.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. Commonly, this is because the signer used the UTD-issued certificate they got by following CKCS #180: Digital Certificates. I received a PDF that has a banner at the top saying, "At least one signature is invalid". How do I fix this error? ExplanationĪdobe does not recognize the certificate used for one or more of the signatures in the PDF. ![]()
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