PDF to Flash Flipping Book is an easy flip book maker for everyone to convert PDF to flash flipping book with adding bookmarks, watermarks, book logos etc. in few minutes. What's more, you can even set password to flipping book. These slides would show you how to easily add a single password to protect flipping book by flip book maker. Free download: http://www.flash-flipping-book.com/pdf-to-flash-flipping-book/index.html