Specifications

In the Certified PDFworkflow, all the modifications done in a PDF document are logged per session
and saved in an edit log file. Also, the edited PDF documents can be saved incrementally. This
means that the changes done in version 3, for example, can be saved “on top of” the changes done
in version 2 but you keep one physical PDF file.
The incremental save principle does not necessarily increase the file size of your PDF document
drastically because Adobe Acrobat only saves the changes made during the different sessions.
The difference in file size may become apparent if you delete a large number of objects, because
these objects are maintained in one or more versions. You can, however, at any stage in the
workflow, “optimize” your Certified PDF document, i.e. reduce its file size, simply by using the
Save Asfunction of Adobe Acrobatand clicking the Certified Full Save button. You will still have a
Certified PDF document with history information about previous editing sessions, but you will no
longer be able to save snapshots of these sessions or use the roll-back mechanism to revert to a
previous state of your Certified PDF document.
To set the Processing preferences on page 101
Roll-back mechanism
The Certified PDF workflow can also offer you a robust roll-back mechanism. Each time you save
your Certified PDF document, a “snapshot” will be included in the file. You may think of a snapshot
as an “image” of the state of the PDF document at the time it was saved. This allows you to revert
to any previous stage in the Certified PDF workflow and to compare different versions of your PDF
document, even though you maintain one physical PDF file.
Note: You cannot save snapshots or use the roll-back mechanism in “optimized” Certified PDF
documents. See also To set the Processing preferences on page 101.
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