MC, 14:29 wtorek, 05.06.2012 r.
Linux - Removing protection from PDF documents
It happens that PDF documents, which we have downloaded, are protected from copying, opening, printing and so on. Therefore I want to show you how to unblock PDFs using tools from Linux systems.
How to remove protection?
If we want to remove protection from PDF document, we can use two simple commands - one for converting PDF to PostScript file, and the next one for converting PostScript file to PDF again, but without protection. I'm talking about pdftops and pstopdf commands. If they don't exist in our system, we have to install ConTeXt package:
sudo apt-get install context
Assuming that out PDF document is named document.pdf, we can type below bunch of commands:
pdftops document.pdf temp.ps
pstopdf temp.ps unblocked_document.pdf
rm temp.ps
pstopdf temp.ps unblocked_document.pdf
rm temp.ps
After that, potection should be removed from the document.
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