PDF Encrypter can be used to protect your PDF files with 128-bit strength user and owner passwords, set all permissions(such as coping, editing, printing, selecting text and graphics, fill in etc), and prevent PDF files from being printed, changed, copied, extracted, signed, filled, assembled and/or merged. It is the fast, affordable way to encrypt a lot of pdf files to encrypted pdf files once time for saving your time! Its easy-to-use...