Device protection on Android phones with new version 5.1 Lollipop

  Yet you can enjoy hard reset but in the future  no more!!!

  Today, Google quietly announced a new version of Android in a small blog post. The new version, Android 5.1, is still called Lollipop, but it will come with a few new features including Device Protection, and HD voice, where your device supports it.
    Device Protection will allow a user to remotely lock their device if it gets lost or stolen. This will
prevent your phone from being used until you log in with your Google account. This protection even remains in place if the person who takes your phone performs a factory reset. These are just a few of the new features that will come in Android 5.1, though Google hasn't released a full changelog. The update is rolling out to certain Nexus devices today, though presumably it will still take a few weeks or months to get to most other devices.
  via:http://lifehacker.com/google-announces-android-5-1-with-device-protection-hd-1690391084