But why would you need a license?

CO Town Considering Hunting Licenses To Shoot Down Federal Drones, Offering Bounties:

DEER TRAIL, Colo. - The town board of Deer Trail, Colorado, will soon be voting on an ordinance that would create drone hunting licences and also offer bounties for unmanned aerial vehicles. A local resident, Philip Steel, drafted the ordinance which outlines weapons, ammunition, rules of engagement, techniques, and bounties for drone hunting.

Although it's against the law to destroy federal property, Steel said, "We don't want drones in town. They fly in town, they get shot down." 

I wonder whether there is a daily limit . . .