@netnomad: I'm downloading pdftk although I do not think will work for me.
As I said before, I can not compile PDFedit.
for the rest I would not be forced to rewrite the pdf from 0
@curaga, i install abiword and the plugin but if I open the pdf shows nothing more than a series of blank pages with some nonsense-characters
@for the rest, I would try to remain independent and free to use libre tool, maybe it's a utopia, but I hope to do that
doing research I found this:
http://live.gnome.org/OCRFeederIs in python, there are many dependencies and then I have to use tesseract (which is in the repositories).
I have not much time and I do not know if I'll make it, but as soon as I can do some testing.
in the meantime are still welcome tips.