TechNote 0006: Digital Signatures in PDF/A-1
TechNote 0006: Digital Signatures in PDF/A-1
TechNote 0006: Digital Signatures in PDF/A-1
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<strong>PDF</strong>/ACompetence Centersigned for document signatures. Object digests have been officially deprecatedby Adobe, and are not <strong>in</strong>cluded <strong>in</strong> the current draft for ISO 32000.1.5 Incremental UpdateModifications to a document, after it has been signed, should be saved as <strong>in</strong>crementalupdates. This method preserves the consistency of the signed data withthe digest and allows for recreat<strong>in</strong>g the state of the document as it existed atthe time of sign<strong>in</strong>g. Be aware, however, that use of this method may cause aviewer to mark the signature as <strong>in</strong>valid, depend<strong>in</strong>g on the changes made.1.6 Multiple <strong>Signatures</strong>A document not only can conta<strong>in</strong> more than one signature field but can also besigned aga<strong>in</strong> (after it has been saved) us<strong>in</strong>g the <strong>in</strong>cremental update feature.2008-03-14 <strong>Digital</strong> <strong>Signatures</strong> <strong>in</strong> <strong>PDF</strong> page 3
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