Folder Lock for IPhone by NewSoftwares.net
Folder Lock for iPhone is the easiest way of password protecting files in iPhone. It lets you secure personal files, documents, pictures, videos, audios and all other private files that you keep in your iPhone. Furthermore, it offers the fastest way of transferring data from your iPhone to a Wi-Fi connected PC and MAC. The app is smart enough to guide you through the process once the Wi-Fi connection is established.
Developer Website: http://www.newsoftwares.net/folderlock/iphone/