Are you trying to open a password-protected PDF or ZIP file? Then, you already know how frustrating it can be. You try out different tools, and the result is a ...

PDF files can contain everything from reviewer proofs of pre-publication books and under-development drafts of confidential intellectual property to proprietary financial data and personal information ...

Because the PDF (Portable Document Format) format is compatible with virtually every major operating system, businesses use it more than any other when they need to send important documents via email ...