The following features needs to be implemented before okular supports digital signature verification:
 1.Signature form field.
- Related Revisions: D11723 D12901
 2.Revision manager to keep track of previously signed versions of the document.
 3.Signature summary dialog to inform user about document’s integrity and authenticity.
- Related Revisions: D13483
 4.A popup to display the signature validation summary.
- Related Revisions: D13484
 5.Certificate properties dialog to display information such as signer’s name, issuer’s name, signing time, algorithm used, intended usage of the certificate, etc.
 6.Signature widget.
- Related Revisions: D13366
 7.Signature panel to provide one point access to signature properties and previously signed versions of a document.
 8.Menu actions.