I mentioned a cool tool yesterday called pdftk that I use at my day job to merge multiple PDF documents into a single PDF. Well that isn’t all pdftk can do! You can also use it to password protect PDF files for better security!
Let’s say I have a PDF called sensitive.pdf with information I don’t want anyone to see. I can protect it with a password by running the following command via the terminal:
#pdftk sensitive.pdf output protected.pdf user_pw SuperS3cr3tPW2014
If you aren’t following the command above you input the original PDF (sensitive.pdf) and output a new PDF called protected.pdf and assign it the password SuperS3cr3tPW2014.
Now you can delete the original file and you can keep the new password protected PDF