Validating xml document
You can apply a certifying signature only if the PDF doesn’t already contain any other signatures. A blue ribbon icon in the Signatures panel indicates a valid certifying signature.
The form author provides XML signing, validating, or clearing instructions for form events, such as button click, file save, or submit.
XML data signatures conform to the W3C XML-Signature standard.
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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.
panel displays information about each digital signature in the current document and the change history of the document since the first digital signature.Each digital signature has an icon identifying its verification status.
Depending on how you have configured your application, validation may occur automatically.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.For more information about signature warnings and valid and invalid signatures, see the Each time a document is signed using a certificate, a signed version of the PDF at that time is saved with the PDF.Each version is saved as append-only and the original cannot be modified.When the form is complete, the agency certifies the document, allowing users to change only form fields and sign the document. However, if they remove pages or add comments, the document doesn’t retain its certified status.