Files hidden but not secure...
Should have a way to turn off iTunes File Sharing within the app, otherwise your hidden files are available to anyone who plugs your device into iTunes. Try this. Plug your device into your computer and open iTunes. Select your device and then scroll to the File Sharing section. Scroll down until you see the My Calculator app. Under the documents section are all of your hidden files and folders. Just select a file or folder and select Save As... Boom, your hidden file are now downloaded to the computer for anyone to see.
newobm about
Private Calculator - File Hider, Secret Photo Video Browser, Image Downloader and Note vault, v4.0