When a document that has been digitally signed is opened in Revu, signatures are automatically checked for validity. One of several icons will appear on the Signatures panel to indicate the status of a signature's validity.
The document has been Certified and the Certification is valid.
The signer's identity is trusted and the document has not been changed. This is a valid signature.
The signer's identity is unknown. If the signer is known and trusted, see Importing a Trusted Identity Certificate to add the identity to your list of trusted identities.
The signature has not yet been validated and the document has not been updated since signed.
The signature is valid, but the document has been updated since being signed.
The signer's identity is unknown and the document has been updated since being signed.
The signature or certification is invalid and the document has been altered since being signed.
To attempt validation on a signature again (for example, if you've installed a certificate that wasn't installed when the file was first opened), right-click the signature on the PDF and select Validate Signature.