At the first launch users sets the main password. Every time you launch MyPass you will need to enter main password so you can see all saved passwords. User can change main password easily.
If user enters main password wrong 3 times, all data will be erased for security reasons. Data is stored on device, no online sync!
If something interrupts app work it will be reseted to the beginning and user will need to enter main password again. If you see that somebody is close to you and tries to see your password, just press LOCK button on the screen, or lock button or home button on the device and app will be reseted to the beginning and user will need to enter main password again.