Removing or blanking PDF text?

As many of you know, I’ve been working for a long time on publishing my father’s novel, Troika. Unfortunately, it’s being released posthumously, though he did get to see a near-final printed copy. The text is now ready to roll, pending one fix that’s had me stuck for a few months.

We’ve decided to put the book out via lulu.com. This means that the book won’t have an ISBN number, but that’s OK, since we expect that it wouldn’t have helped get it out, and would have created more obstacles than it was worth.

However, on the copyright page of the book, we had put a line with a dummy ::wikipedia(”ISBN”,”ISBN”):: number, which was going to be replaced with the real one, once we got it. That line has to go now, either removed from the PDF file or printed in clear type so it’s invisible.

The problem is that the file exists only in the near-final PDF format, and I don’t have the tools needed to tweak it. As far as I can tell, the only tool that can handle it is Adobe Acrobat, which is quite expensive. One would think that open source tools would be available, since the PDF format is open, and tools exist to read PDF files. Tools such as koffice can import and export PDF, but not as perfectly as something that would edit it directly.

So… tossing this out to the group mind: does anyone know a way to do this? Or would any of you who might have the right tools be willing to get the file from me and do this fix?

Thanks for any enlightenment…