Password Protected Photos is a secured storage location for your pictures. The default username is user and the default password is pass. Again, user / pass to login the first time and then go to Setting to change them to whatever you like. You can also enable TouchID instead so either way will authenticate you into the application.
Add existing pictures from your Photo Library or use the camera to add new pictures directly into the application. Images from the application can also be saved back to the Photo Library, printed, sent via text message, or sent to another application (depending on what apps you have installed, ie Facebook, etc).
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