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The invalid state is called when a user alters the XML-signed content.Long-term signature validation allows you to check the validity of a signature long after the document was signed.You also specify the types of changes that are permitted for the document to remain certified.For example, suppose that a government agency creates a form with signature fields.Acrobat trusts all certificates for signing and certifying that chain up to a trust anchor.Therefore, administrators should preconfigure client installations or let their end users add a trust anchor or anchors.The feature lets you find out if the document contains any dynamic content or external dependencies.
However, PDF signatures have multiple data verification states.
A digital ID is required to add the certifying digital signature.
Acrobat provides users with the capability to add a document timestamp to a PDF without also requiring an identity-based signature. (See Configure a timestamp server.) A timestamp assures the authenticity and existence of a document at a particular time.
These timestamps are compliant with the timestamp and revocation features described in Part 4 of ETSI 102 778 If the signature status is unknown or unverified, validate the signature manually to determine the problem and possible solution.
If the signature status is invalid, contact the signer about the problem.
The form author provides XML signing, validating, or clearing instructions for form events, such as button click, file save, or submit.