last week a customer had the problem that he lost a Word Document which he wants to print. Only a pdf of the document was available but in this file the print protection flag was set.
I used Ghostscript to reset the print protection.
Install Ghostscript and use this command line to write a new version of the pdf file which is printable
gswin.exe -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=d:\temp\OUTPUT.pdf -c .setpdfwrite -f D:\Temp\input.pdf