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The user can validate the signature if the Root CA is already installed on Microsoft Certificate Store. As an alternative, the recipient must manually add the Root Certificate of the signing certificate on Adobe Trusted Identities.

Once a PDF has been digitally signed, it is usually impossible to edit without compromising the signature. And it's precisely the purpose of an electronic signature not to be able to tamper with a signed document! However, in some cases, it is possible to amend the file in a way that keeps the original signature valid.

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.

To customize a new signature appearance: Choose Edit > Preferences (Windows) or Acrobat > Preferences (Macintosh). Choose in the left-hand list: x and earlier: Security and in the Appearance panel, choose New or Edit. x: Signatures > Creation and Appearance > More, and in the Appearance panel, choose New or Edit.

How to edit a digitally signed PDF document as the owner? Open the document that you want to change. Go to ?View? ? ?Digital Signatures?. ... On your left, you should now see a list of all digital signatures contained within your document. Right-click your signature and choose ?Clear Signature?.

Remove digital signatures from Word or Excel Open the document or worksheet that contains the visible signature you want to remove. Right-click the signature line. Click Remove Signature. Click Yes.

Open the PDF document or form that you want to sign. Click the Sign icon in the toolbar. Alternatively, you can choose Tools > Fill & Sign or choose Fill & Sign from the right pane. The Fill & Sign tool is displayed.