Adobe 22002486 Digital Signature User Guide - Page 122
Viewing and Comparing Changes and Versions, 5.2.3, Viewing a List of Post-Signing
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Acrobat 9 Family of Products Security Feature User Guide Validating Signatures Troubleshooting a Document Integrity Problem 122 7.5.2.2 Viewing and Comparing Changes and Versions Document authors and recipients often need to know if a document has changed since it was signed. Acrobat keeps track of a document's version number, stores previous document versions in their entirety, and enables users to compare document versions by work and page. When you open a document, the latest version is always displayed whether or not it is the signed version. Document recipients should always remember the following: Every time a document is signed, the entire document at the point of signing is stored in the PDF as an incrementally numbered version. A signature signs a document at a specific point in time; that is, signature X signs version X and signature Y signs version Y. You can view exactly what the document looked like at that point in time using View Signed Version. For details, see the following: Chapter 8, "Document Integrity and Preview Mode". "Viewing a List of Post-Signing Modifications" on page 122. "Comparing a Signed Version to the Current Version" on page 123. 7.5.2.3 Viewing a List of Post-Signing Modifications Because it is possible to change a document without changing its appearance, the list of post-signing modifications is often a superset of what is visually displayed when comparing documents using Document Compare. Therefore, a thorough analysis of a signed document's integrity includes viewing the document modifications list. To view a list of post-signing modifications, open the Signature pane and view the change history. All changes are listed in chronological order. Note that you can also do the following to get a more condensed list: 1. Right click on a signature and choose Show Signature Properties. 2. Choose the Document tab. 3. Choose Compute Modifications List. The list is capable of showing the following: Fields (with field names) that have been created, modified, deleted, or filled in. Annotations (comments) that have been created, modified or deleted. Pages that were created, modified or deleted. Spawned pages, deleted spawned pages, and modified spawned pages. Attachments that have been added, deleted, or modified. Miscellaneous: Some changes which occur in memory or cannot be explicitly listed are labelled miscellaneous.