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+This program is able to extract page mode and named destinations as
+PDFmarks from PDF.  By using this you can get small PDF files that have
+preserved them.
+
+When you create a PDF document using a TeX system, you may include many
+small PDF files in the main PDF file.  It is common for each of the
+small PDF files to use the same fonts.
+
+If the small PDF files contain embedded font subsets, the TeX system
+includes them as-is in the main PDF.  As a result, several subsets of
+the same font are embedded in the main PDF.  It is not possible to
+remove the duplicates since they are different subsets.  This vastly
+increases the size of the main PDF file.
+
+On the other hand, if the small PDF files contain embedded full font
+sets, the TeX system also includes all of them in the main PDF.  This
+time, the main PDF contains duplicates of the same full sets of fonts.
+Therefore, Ghostscript can remove the duplicates.  This may considerably
+reduce the main PDF file's size.
+
+Finally, if the small PDF files contain some fonts that are not
+embedded, the TeX system outputs the main PDF file with some fonts
+missing.  In this case, Ghostscript can embed the necessary fonts,
+significantly reducing the required disk space.
+
+Either way, when Ghostscript reads the main PDF produced by the TeX
+system and outputs the final PDF it does not preserve PDF page mode,
+named destinations, etc.  As a result, when you open the final PDF, it
+is not displayed correctly.  Also, remote PDF links will not work.