File Locker (Image and Video Hider) is described as 'Hide images and videos directly from gallery and maintain files you hided which provides easy access to files.
You can also change theme of locker' and is an app. There are more than 100 alternatives to File Locker (Image and Video Hider) for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best File Locker (Image and Video Hider) alternative is VeraCrypt, which is both free and Open Source. Other great apps like File Locker (Image and Video Hider) are Cryptomator, TrueCrypt, LUKS and Axcrypt.