Password protecting and encrypting received pdf file

Hello there,
how can I password protect (and encrypt) a pdf file that I received from someone else? For example, I may get a copy of my tax return from my accountant that I don't want anyone else to see on my computer or when I back up contents of my computer online.
I have only Adobe Reader 8 installed on my computer. So I am not writing these pdf files myself - I realize that then I would have full control over the security settings.
Microsoft Word and Excel files I can password protect. How can I do this for "received pdf files"?
Thank you for your help.

You need Acrobat, not Reader.
Be aware that even then, PDF security is easy to bypass.
I use a Mac for the most part but isn't there any features in Windows that will allow you to protect folders?

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Hi... I would like to purchase a Tablet Sony Xperia Z 2 10.1 (the last one of the Z series) and I was told that Adobe does not support Sony anymore.... I need to be able to open and read Adobe PDF files and I would like to know if this tablet can still use Flash Player...
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Password protecting and encrypting received pdf file

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