This handy dandy command script will allow you to strip the owner password out of a pdf file:
gs -q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -sOutputFile=unencrypted.pdf -c .setpdfwrite -f encrypted.pdf
Works in linux, mac and cygwin.
Alternately, you can crack the owner or user password from a pdf file using the open source utility PDFCrack:
http://pdfcrack.sourceforge.net/
Additionally, you can remove copy/print/save security from a PDF via Ensode's handy online tool over at: http://www.ensode.net/pdf-crack.jsf
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