What are the differences between Certified and Approval signatures?
Most digital signatures are referred to as approval signatures. Signatures that certify a PDF are called certifying signatures. Only the first person to sign a PDF (most often, the author) can add a certifying signature. A certifying signature attests to the contents of the document and allows the signer to specify the types of changes allowed for the document to remain certified. Changes to the document are detected in the Signatures panel. Approval signatures are performed when someone signs a document to show consent, approval, or acceptance. A certified document is one that has a certification signature applied by the originator when the document is ready for use.
