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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.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.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.The trust level of the certificate indicates the actions for which you trust the signer.You can change the trust settings of certificates to allow specific actions.For example, you can change the settings to enable the dynamic content and embedded Java Script within the certified document.
You can also use When you certify a PDF, you indicate that you approve of its contents.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.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.
Alternatively, they add certificates directly from signatures in signed documents and then set trust levels.