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The FAA says every UAV over 1/2 pound must be registered.

"The online registration would apply to owners of small drones weighing more than 0.55 pounds and less than 55 pounds, including payloads such as on-board cameras, according to a statement by the FAA.

“Make no mistake: unmanned aircraft enthusiasts are aviators and with that title comes a great deal of responsibility,” U.S. Transportation Secretary Anthony Foxx said in a statement. “Registration gives us an opportunity to work with these users to operate their unmanned aircraft safely. I’m excited to welcome these new aviators into the culture of safety and responsibility that defines American innovation.”

The new rules would require drone owners to pay a $5 registration fee. Penalties go up to $27,000 for civil violations, $250,000 for criminal acts with up to three years behind bars."

Take off weight of the popular camera carrying UAVs like the DJI Phantom is 1300 grams (over 2 lbs), so this covers a LOT of toys.