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21 August 2012 Reply
I'm not aware of any libraries that support extended editing of a PDF file, although there's quite a few that would let you create them. Open source ones include PDFSharp and iTextSharp. I've also used cete's Dynamic PDF extensively (this is a commercial product) and while it would allow you create PDF files it has a disappointingly limiting API and is overall a poor product. We are currently evaluating TallPDF which already seems to be an order of magnitude better than cete's offering, although I personally haven't used it yet. However, there's lots and lots of libraries out there!
Sorry I can't be of more help. I've done lots of work generating PDF's, but not editing them :)