Some PDFs are encrypted with a password, which you’ll need to enter each time you want to view the document. You can remove the password to save yourself some inconvenience if you’re keeping the PDF in a secure location.
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How to Remove a Password From a PDF File
Some PDFs are encrypted with a password, which you’ll need to enter each time you want to view the document. You can remove the password to save yourself some inconvenience if you’re keeping the PDF in a secure location.
Full article