Signatures are validated when a document is opened, and then automatically re-validated when anyone changes the document.
To view the status of your certificates and signatures, do one the following:
The Signatures pane lists all signatures in the PDF document, shows their validity status, and provides a summary of each signature.
If your PDF document contains signatures, the Signatures tab appears on the left of the window. To open the Signatures pane, click the Signatures tab.
TIP: To jump to the location of a signature in the document, click on the signature in the Signature pane. A yellow rectangle highlights the selected signature.
To see more information about a digital signature or certificate from the page of a PDF document, click on the signature. The Signature Properties dialog appears, and lets you do the following:
|Valid||This document is certified, and the document has not changed in a way not permitted by the certificate|
|Valid||The identity of the signer was successfully verified, and the document has not been changed since this signature was added|
|Change view||The identity of the signer was successfully verified, but the current view of the document is not the same as when it was signed|
|Unknown||The identity of the signer was not able to be verified, and the current view of the document is not the same as when it was signed|
|Unknown||The identity of the signer was not able to be verified, but the document has not been changed since this signature was added|
|Invalid||The certificate is invalid, or illegal changes have been made to the document|