pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf
pdftk *.pdf cat output all.pdfpdftk a.pdf output b.pdf owner_pw passpdftk a.pdf output b.pdf user_pw passpdftk 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.pdfpdf tk source.pdf stamp water.pdf user_pw userpw owner_pw ownerpw output dest.pdf