The method of batch encrypting PDF and adding PDF watermark with pdftk command
Pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdfpdftk * .pdf cat output all.pdf encryption modify password pdftk a.pdf output b.pdf owner_pw pass encryption access password pdftk a.pdf output b.pdf user_pw pass decryption access password pdftk a.pdf input_pw pass output b.pdf watermark each page of PDF # prepare watermark PDF (water.pdf) style pdftk book.pdf stamp water.pdf output book_stamp_all_page.pdf encryption access, encryption modification Add watermark pdf tk source.pdf stamp water.pdf user_pw userpw owner_pw ownerpw output dest.pdf
