How to encrypt PDF files or protect PDF files on Linux system?

We have two copies of VeryPDF Encrypt PDF Command Line personal user license, can we get Linux installer? one of user uses only Linux.

Customer
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Thanks for your message, if you need to encrypt the PDF files on Linux system, you may download "VeryPDF PDF Toolbox Shell for Linux" from our website to try, you can use "VeryPDF PDF Toolbox Shell for Linux" on Linux system to protect your PDF files easily,

http://www.verypdf.com/app/pdftoolbox/linux.html
http://www.verypdf.com/app/pdftoolbox/try-and-buy.html#buy-linux

The trial version of "VeryPDF PDF Toolbox Shell for Linux" can be downloaded from this web page,

http://www.verypdf.com/dl.php?file=pdftoolbox_cmd_linux.tar.gz

after you download it, you can run following command line to protect your PDF files,

pdftoolbox sample_in1.pdf -outfile "_permit_secure.pdf" -ownerpassword 123 -key128bit -permit printing modifyannot

Encrypt a PDF using 128-bit strength:
pdftoolbox 1.pdf -outfile 1.128.pdf -ownerpassword foopass

Set an owner password and an user password to a PDF file:
pdftoolbox 1.pdf -outfile out.pdf -ownerpassword opwd -userpassword upwd

Enable High Quality Printing when encrypt a PDF file:
pdftoolbox 1.pdf -outfile out.pdf -ownerpassword opwd -userpassword upwd -permit printing

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