Creating PDFs from exported PNGs forms the next sequence of the PowerPoint to Secure PDF tutorial series. Before you proceed, make sure that you have the slides exported as PNGs from within PowerPoint. You’ll also need to have Adobe Acrobat Pro installed on your system — this is a different animal than the free Adobe Acrobat Reader. You can download a trial version of Adobe Acrobat Pro from the Adobe site — at the time of writing, version 9 of Adobe Acrobat Pro was current. If you have a different version of Adobe Acrobat Pro, the process will be still similar.