HOW TO PASSWORD PROTECT YOUR PDF IN UBUNTU USING PDFTK?
IF YOU HAVE A CONFIDENTIAL PDF AND YOU WANT TO SHARE IT WITH ONLY THE DESIRED PERSON , PUT A PASSWORD IN IT USING PDFTK.
PUT A STRONG PASSWORD AND SHARE THE PDF ,PERSON HAVING THE PASSWORD WILL ONLY BE ABLE TO ACCESS IT.
sudo apt-get install pdftk
pdftk "nameofpdf".pdf output "newpdf.pdf" user_pw "password"
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