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How to password-protect a PDF file on Ubuntu

July 25, 2014

In a terminal, type:

sudo apt-get install pdftk

Then, to add a password to a PDF file, type:

pdftk <input-file> output <output-file> user_pw <password>

Example:

pdftk input.pdf output output.pdf user_pw 1234
#linux #password #pdf #ubuntu

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