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1. Concat two PDF files

   With GhostScript:

   $ gs -q -sPAPERSIZE=a4 -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=out.pdf a.pdf b.pdf
   

2. PDF Reference

   http://www.adobe.com/devnet/pdf/pdf_reference.html

3. Remove the "owner" password

   $ java -classpath Multivalent20040415.jar tool.pdf.Decrypt file.pdf
   

   Multivalent20040415.jar