$ pdftops [your_protected_pdf_document.pdf] out.ps
$ ps2pdf [out.ps] broken_protection_pdf_document.pdf
http://www.cyberciti.biz/faq/removing-password-from-pdf-on-linux/
Type the following command to install the qpdf:
$ sudo apt-get install xpdf-utilsFirst, decrypt a PDF and create a postscript file, enter:
pdftops input.pdf out.ps
You will get input.ps file. This can be printed or open under Linux itself. But, you can convert it back .ps file (postscript)back to a PDF as follows:
ps2pdf out.ps ready.pdf
Please note that the ps2pdf command is part of ghostscript and it will get installed when you run xpdf-utils.
Now you can convert it with Nitro PDF https://www.gonitro.com/pro
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