Today’s featured promo on MacUpdate offers PDFKey Pro for US$9.99 (50% off, retail $19.99). “PDFKey Pro is a Mac OS X utility to unlock and decrypt password-protected PDF documents. It removes editing and printing passwords if these have been forgotten. PDFKey Pro can now also protect your PDF files with a password to prevent unauthorized access and/or restrict usage permissions. PDFKey Pro can also integrate in complex workflows using command-line and Automator tools (included).” PDFKey Pro requires Mac OS X 10.3.9 or later.