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Open the pdf file and Right click on the Question Mark showing the Validity Unknown. Click on Show Signature Properties. Click on Show Signer's Certificate & Select Trust. Click Add to Trusted Identities & Click OK.

View digital signature details Open the file that contains the digital signature you want to view. Click File > Info > View Signatures. In the list, on a signature name, click the down-arrow, and then click Signature Details.

5 Steps for Validating Digital Signatures In a PDF Open the digitally signed PDF that you need to validate using Power PDF. Locate the digital signature object within the document. Right click or command-click on the signature object. Select "Verify Signature" from the context menu.

Select the Trust tab in the 'Certificate Viewer' window. Select Add to trusted certificates to add the certificate as a trusted source, and select OK. Select the Certified documents check box to trust this certificate, and select OK. Select Validate signature.

Click on the Signature Properties button to check signature properties. In the signature Properties window click Show Signers Certificate button. Following screen will be displayed once you click on it. Initially you will get the summary of the Digital Signature in the certificate viewer window.

1) Right-click on the 'validity unknown' icon and click on 'Validate Signature'. 2) You will get the signature validation status window, click on 'Signature Properties'. 4) Verify that there is a certification path. This identifies the owner of the digital certificate that has been used when signing the document.

Are you referring to the certificate based digital id or a simple signature created in Acrobat. You refer to this location - C:\Users\username\AppData\Roaming\Adobe\Acrobat\DC\Security\x. pfx and check the file.