How to digitally sign a PDF when you don't have access to a printer and scanner

You can digitally sign a PDF in several different ways, including Adobe Acrobat, Apple's Preview app, and mobile apps, among other options.
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SERIES OF CLICKS WILL FIX ADOBE PDF FILE-VIEWING ERROR

Q: I cannot open Adobe PDF files on the Internet while using the latest Adobe Reader software on my new Windows XP computer. When I click on a PDF file when I am on the Internet, a window opens and ...