I would like to know why so many suggestions for you. Must be confusing. Here is what you do to read your PDF. First, open up your PDF in Adobe Reader and make sure it scans the document. When you try to read it, JAWS will say "Blank Document." Now, press insert + spacebar, and press O then press D. This will cause JAWS to do OCR on the PDF document and in a minute or so, JAWS wil begin reading the PDF to you after it does the OCR. Your Pdf will now be in a nice virtual buffer so you can copy and paste and do all you would to a word document. If you close the document before you are done reading the entirety of it, you will have to do all of the steps all over again to have JAWS do the OCR on it. Since you have JAWS 16, you can use the steps I gave you to have JAWS do the OCR and read the document. You do not need OpenBook or any of that! I hope this helps and works well for you.
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