Connecting to internet validating identity
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.
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.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.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.
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.
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.
Acrobat trusts all certificates for signing and certifying that chain up to a trust anchor.