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PDF is short for Portable Document Format which is great for business use and sharing for its wide compatibility and safety. But nothing can be perfect, PDF file also has its disadvantage. For example, many business PDF files are secured by password, if you want to edit or split it, you are not allowed to do that because of the PDF password security.
Learn more: http://www.epubor.com/how-to-edit-secured-pdf-files.html