If you own a drone that weighs between .5 and 50 pounds, you are now required by federal law to register it [url=https://registermyuas.faa.gov/restricted#/]here[/url].
By registering it, you agree that you will stay below 400 feet, not fly near airports and no fly zones, not use it to spy on anyone, etc.
If you do not register your drone, you face possibility of fines in the thousands of dollars, and potentially jail time.
Even if you have multiple drones, you only have to register once. You will code a code that you must label all of your drones with.
There is a fee of $5, but if you register before January 21, your $5 will be refunded to you.