Activating a password-protected screensaver is a simple and very effective way to prevent an unauthorized person from rifling through the data on a computer or other device that’s been inadvertently left on or lost. All versions of Windows and Apple operating systems allow you to add a password to a screensaver. Remember to log out of any applications containing sensitive data and lock your screen when you leave your desk, or set a fairly short wait time on your screensaver so that it locks automatically if you step away. BlackBerry, Android, iOS and Windows mobile devices also have an automatic screenlocking feature. Turn it on so prevent anyone that finds your lost or misplaced phone or tablet from accessing the data on it.