System information

In the Certified PDF workflow, 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 As function of Adobe Acrobat and 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.

Roll-back mechanism

The Certified PDF workflow can also offer you a robust roll-back mechanism. Each time you save

your Certified PDF document by choosing File > Save (or pressing CTRL+s) , 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 Saving an optimized Certified PDF document on page 107 and Saving snapshots

on page 103.

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