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pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf
pdftk *.pdf cat output all.pdf
pdftk a.pdf output b.pdf owner_pw pass
pdftk a.pdf output b.pdf user_pw pass
pdftk a.pdf input_pw pass output b.pdf
# 提前准备好水印PDF(water.pdf)样式
pdftk book.pdf stamp water.pdf output book_stamp_all_page.pdf
pdf tk source.pdf stamp water.pdf user_pw userpw owner_pw ownerpw output dest.pdf