There are many government regulations that apply to drone flights that are conducted in the national airspace (i.e., outside of an enclosed structure). In the United States, the Federal Aviation Administration (FAA) requires operators to be aware of regulations regarding the use of small UAVs and comply with them. 

YOU ARE RESPONSIBLE FOR KNOWING OF AND COMPLYING WITH ALL REGULATIONS. The FAA maintains a fact sheet with information about its regulations here:  FAA NEWS and FACTS Before flying we ask that you consult Know Before You Fly, a site created by industry groups in partnership with the FAA to educate users about responsible operation of UAV/UAS. Additionally, there are many areas that drones are not allowed to fly. The FAA maintains important information about restricted areas here: Airspace Restrictions 

FPV Regulatory Information

The use and operation of this type of product in the USA and many other countries may require a license and some countries may forbid its use entirely. In the USA, you will need a "HAM" amateur radio license, and It is your responsibility to ensure that the use of this product meets the requirements imposed by your government's rules and regulations for RF devices. Do not purchase this product if you are unsure of the government requirements or are not able to comply with them. We cannot be held responsible for your actions if you purchase and/or use this product in violation of your government's regulations. By agreeing to our terms and conditions during the check-out process, you also agree to have read and to understand this notice.