2021. január 4.

Note: How to password-protect a PDF file on Ubuntu

This is a copy of this post for safe-keeping: 


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