Private Photo Video Locker isn't just another app disguised as an ordinary calculator, it's actually a software that hides unlisted, Shared, and Sandbox pictures on your smartphone. It works by generating a code that locks the contents of the file and only allows viewing of these images through an internet browser. This application doesn't really have any great features to speak of, and doesn't really do anything beyond this basic functionality, so it will probably be more useful as a wallpaper instead of an actual working program. However, if you need something more advanced or specialized for your smartphone, then you might find a better solution.
Multimedia: If you use your Smartphone for something other than checking your emails or surfing the web, then the chances are that you use it to view videos too. The good news is that there is finally an application that allows you to watch all your videos via the default YouTube channel, and even integrates directly with the Windows Phone Store so you can access movies from your Movies & TV app. If you are looking for a way to view all your videos across multiple devices, then this is the answer. If you want something that lets you customize your privacy settings, then you may also want to look into Multimedia. The advantage of using Private Photo Video Locker along with Multimedia is that it will hide your screen name and any identifying information that is displayed so your friends and family can't track you down.
Secreto: With the new Windows Mobile 7.5 build, Microsoft has finally introduced the long awaited, extremely sought out feature for their smartphones. Users of the new phones can now lock their screen to restrict what others can see and know about your life. This new feature, known as "Secreto" has a few different options, namely: Private Photo Video Locker, which will allow you to view your videos on any of your connected Windows Phone devices, or on the web via Microsoft's web browser. In addition to that, it also allows you to access BVMs and share them with friends. The private video option also lets you encrypt your videos with the Passport code set in it so they can't be viewed on a computer or other unsecured network.