I doubt the geofencing is intended to thwart DEFCON attendees who intentionally wish to update the onboard geofencing database. What it will probably be largely

I doubt the geofencing is intended to thwart DEFCON attendees who intentionally wish to update the onboard geofencing database. What it will probably be largely effective for is the other 99% of drone fliers, some of whom fly their drones too close to airports likely because they are completely ignorant and oblivious of the rules and inherent danger in what they are doing.