XML data signatures conform to the W3C XML-Signature standard.
Like PDF digital signatures, XML digital signatures ensure integrity, authentication, and non-repudiation in documents.
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Acrobat and Reader support XML data signatures that are used to sign data in XML Forms Architectures (XFA) forms.
The form author provides XML signing, validating, or clearing instructions for form events, such as button click, file save, or submit.
Which is 9 number followed by one letter that is v, V, x or X.
When you receive a signed document, you may want to validate its signature(s) to verify the signer and the signed content.
It then suppresses that content, allowing you to view and sign the document in a static and secure state.
The feature lets you find out if the document contains any dynamic content or external dependencies.
If the signature status is invalid, contact the signer about the problem.
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.
For example, you can change the settings to enable the dynamic content and embedded Java Script within the certified document.
panel displays information about each digital signature in the current document and the change history of the document since the first digital signature.
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