that's horse manure. I retrieve data from, edit and manipulate PDFs on an almost daily basis. Adobe Acrobat (not the reader) is fantastic at PDF manipulation. It is true, however, that PDFs created by the programs that generated the original non-PDF document are FAR easier to manipulate than those created from scanned paper. About the only thing that Acrobat has issues with is circumventing security measures on PDFs, which is by design. In those cases, I have yet to come across a PDF whose security Calibre was not able to easily crack. You are right on your third point.