Click OK, and again until you exit from the all the dialogue boxes.Adobe Security window opens, click “OK”. Click “Show Certificate button” (under the summary tab).Click on “Signature Panel” button on the left hand side of Adobe Reader / Acrobat.You can add the certificate that was used to apply the digital signature into Adobe’s list of Trusted Identities by following these steps: Don’t do it for any random certificate as this can be a security issue and is not actually required if you just want to view the PDF. Warning: only do this if YOU trust the certificate. To resolve this issue you need to make Adobe trust the certificate that was used to sign the PDF. You also won’t be able to manually validate the signature until the certificate is trusted by Adobe. It’s important to note that this message is not saying that your digital signature is invalid and it’s not saying that the PDF has been modified since it was signed (see the text in the screenshot above: “Document has not been modified since this signature was applied”), it’s just saying that Adobe wasn’t automatically able to validate the certificate. Digital signatures that were added using what’s called a “self-signed certificate” - usually a certificate that you have generated yourself using a third party application - cannot be automatically validated by Adobe because the certificate is not in the list of Trusted Identities that Adobe uses to validate signatures.
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