Ubuntu - PDF - Remove password from pdf

There are many tools that can manipulate PDFs, including:

NOTE: The PDF Toolkit (pdftk) works for me, so instructions below are using this.

Using the PDF Toolkit (pdftk)

sudo apt install pdftk

pdftk secured.pdf input_pw password output unsecured.pdf

sudo apt install qpdf

qpdf –password=password –decrypt secured.pdf unsecured.pdf

sudo apt install xpdf-utils

pdftops -upw password secured.pdf unsecured.pdf