To password protect a PDF in Adobe Acrobat Reader, you'll need the paid Pro version, which starts at $14.99 a month.
19don MSN
How to combine PDF files
From Adobe Acrobat to free online editors and built-in tools, here’s how to merge multiple PDFs into one document.
You can sign PDF documents in Windows, completely electronically, using the PDF viewing program Adobe Reader. Here's how.
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