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A-PDF is a tool that has a collection of features including encrypting and decrypting a PDF file. You can unlock a PDF that is locked. You can also put page numbers, put password, scan a PDF and much more. It is a free tool that requires 10 MB hard disk space.

Get A-PDF here http://www.softpedia.com/get/Office-tools/Office-suites/PDF-A-Quick-Master.shtml

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