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![How to Password Protect a PDF File? [A-PDF.com]](http://www.a-pdf.com/faq/i/screenshot_of_A-PDF_password_security_single_settings.gif "How to Password Protect a PDF File? [A-PDF.com]")
How to Password Protect a PDF File? [A-PDF.com]
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What Is a Document Open Password? (PDF User Password)
