Merge PDFs and retain their index (xref-Table?)

Question

Hi,

I want to merge two PDF-files retaining the index (the xref-table) of both files.

I wanted to write my thesis in LaTeX, except for the covering page which is rather fancy and complex. Now I want to merge the covering page of my thesis with the contents, but I could not accomplish this job with retaining the index using the following tools:

• pdftk and the
• tools presented in http://stackoverflow.com/questions/848513/lossless-merging-of-pdfs-php.

The PDF Toolkit (pdftk) provides a "dump_data" command with which it is possible to extract metadata information including the bookmarks. This data can be brought into a pdf-file using the "update_info" command which works, except for the bookmarks.

Can anybody out there give me a tip on how to work that out?

Thanks for helping me, Rainer