Amazon wants to patrol your home for you:
www.npr.org
And their patent on a privacy geofence will help them do it without invading your neighbors‘ privacy:

Amazon Explores Having Its Drones Provide 'Home Surveillance' For Customers
The tech giant is moving closer to a future in which customers order drones to hover around a home and scan for things like a garage door left open, a broken window, graffiti or a fire.

And their patent on a privacy geofence will help them do it without invading your neighbors‘ privacy:
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