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Verification details are listed beneath each signature and can be viewed by expanding the signature. This feature analyzes the document for content that may alter the appearance of the document.It then suppresses that content, allowing you to view and sign the document in a static and secure state.Like PDF digital signatures, XML digital signatures ensure integrity, authentication, and non-repudiation in documents.However, PDF signatures have multiple data verification states.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.
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.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.Some states are called when a user alters the PDF-signed content.
In contrast, XML signatures only have two data verification states, valid and invalid.Signature validity is determined by checking the authenticity of the signature’s digital ID certificate status and document integrity: In Acrobat or Reader, the signature of a certified or signed document is valid if you and the signer have a trust relationship.