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iSafePDF - iSafePDF is a free open source PDF protection software.
PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
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PDFTools by SheelApps - PDFTools
QPDF - QPDF is a command-line program that does structural, content-preserving transformations on PDF...
PyPDF2 - PyPDF2 - A utility to read and write pdfs with Python