removing the password from PDF files.

PDF files with passwords really do not make much sense. You can remove the PDF password easily, and for free. You just need ghostscript installed.

gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=PDFnopass.pdf -c .setpdfwrite -f PDFwithPASSWORD.pdf