View & validate signatures in PDF files

You can view and verify signatures by looking at them on the pages of your document or viewing them altogether in the Signatures pane.

To open the Signature pane:

• On the Home ribbon tab, in the Show/Hide group, click Signatures.

Signatures are validated when a document is opened and then automatically re-validated whenever changes occur in the document. You can view the status of each by looking in the Signatures pane, or by clicking on the signatures themselves. To check the status at a glance, use the icons that appear along with the signature.

Status	Icon	What it means
Valid		This document is certified and the document has not changed in a way not permitted by the certificate.
Valid		The certificate is valid and the document has not been changed since this signature was added.
Change view		The certificate is valid, however the current view of the document is not the same as when it was signed.
Unknown		The certificate is not trusted as it could not be properly verified. The document does not appear to have been changed.
Unknown		The certificate is not trusted as it could not be properly verified. Unable to determine if document has been changed.
Invalid		The certificate is invalid or Illegal changes have been made to the document.