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Stephen Noeleft a comment
I had been trying to find a PDF editor, in Linux that would edit scanned documents. I can tell you that it is not easy. I was amazed at this software PDF Studio Pro. It does not only edit scanned documents but a whole range of edits including creating PDF's. Brilliant, fantastic software and on Linux, what more do you want. Oh, and in Windows.
PDF Studio - PDF EditorAn easy to use, full-featured PDF editing software