What is the Android Device Owner?
The Device Owner is a unique software on an Android system. This software controls specific remote maintenance functions silently without interaction, without rooting the Android. Google introduced this mode for corporations who want to equip secure company controlled devices to their staff.
This is perfect for digital signage media player. You do not need unsecure rooted devices anymore. Garlic-launcher is a very tiny native app, which offers an interface with digital signage maintenance functions to Android.