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Check bellow the solution i found for on the fly protecting a pdf file in php for resolving this problem i wanted a free library download the library used protect pdf in php from and use the code bellow for password protect a pdf file using php php. Password protect your content with web page password protect by just adding one line of php code to your page source script will present user with password entry form and will not let visitor see your private content without providing a password. Password protect a presentation first how not to protect a presentation whatever anyone may tell you saving your presentation as a powerpoint show pps ppsx file offers almost no protection at all. Microsoft office password protection is a security feature to protect microsoft office word excel powerpoint documents with a user provided password as of office 2007 this uses strong encryption earlier versions used weaker systems and are not considered secure office 2007 2013 employed 128 bit key aes password protection which remains secure. Whether you want to store sensitive data on a usb drive securely email it or just add an additional layer of security on your hard drive there are a variety of ways to protect your files with a password