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Re:Free PDF merging tool that works without any file upload ... by hbcondo714 on Tuesday October 20, 2020 @02:11AM (#24834379)
Anything for password protecting PDFs without any file upload?
Re:Free PDF merging tool that works without any file upload ... by aojdwhsd on Tuesday October 20, 2020 @08:45PM (#24843840)
qpdf: http://qpdf.sourceforge.net/

It has other neat features too (like stripping print/edit restrictions).