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Remove PDF password in Linux
Using QPDF
QPDF is a command-line program for Linux that converts from one PDF file to another equivalent PDF file while preserving the content of the file. The tool allows you to encrypt and decrypt, web-optimize, and split and merge PDF files.
If you are using Manjaro, QPDF should be already installed. In case it is not, try with:
sudo pacman -S qpdf
To convert a secured file into an open one, use this command:
qpdf --password=mysecretpassword --decrypt the-secured.pdf new-unsecured.pdf