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I found this video from adobe how to protect your document. I am using latest Adobe Acrobat Reader 9. Note I am trying to put password inside the reader itself. If I go to

File > properties > security

everything is simply disabled. If I go to

help > plugins

There is a plugin for security but I can't seem to find it or install it to put that feature in. Does anyone know regarding Adobe Acrobat Reader only. If it can't be achieved with Reader alone, than other help will be appreciated.

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Acrobat Reader can only show you PDF files, editing is not available. To protect a PDF file you need Adobe Acrobat Pro.
I'm not sure but it might be also available in third party tools (more likely in commercial ones).

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But even security feature can't be added through a plugins? – Dave Feb 16 '12 at 14:35
@Dave: No, Adobe Reader is only for viewing. – Rainer Feb 16 '12 at 14:42

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