All you have to do is select the ones you want to hide. Once you've entered the secret code, you'll have complete access to a list of all the apps installed on your smartphone. This code is the password you'll need to access all your hidden information and files. The first thing you have to do to use HideX - Privacy Lock – Lock Video & Hide Photo is set up a security code. With this app, you can hide anything you want with an app that looks like a calculator app. HideX - Privacy Lock – Lock Video & Hide Photo is a security app that you can use to hide private files from prying eyes, keeping your personal information, images, and videos safe.