I create lots of PDFs of Excel solutions for my students. I secure these so that they are only hi-res printable and viewable by visually impaired but cannot be modified by the students. I use the same password always and that is adequate for me. I wish this could be made into a default password so that attaching and detaching the password is easier. In fact, I would like to be able to do it to say 20 PDFs at a time, using the multiple file feature presently available for adding header/footer, water mark and background image. Does this capability already exist in the Acrobat?
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