All radio transmitting devices are licensed and controlled by the government of whichever country you live in. They are the ones who decide who may use what, for what purpose and how much you have to pay for the privilege. In the United States, this licensing comes from the FCC or Federal Communications Commission, but every other country in the world has their own government which regulates radio use and issues licenses. (In some countries, people even have to buy a license to listen to radio or to watch 'free to air' TV broadcasts.) In some cases the operator is licensed (Amateur Radio) while in other cases it is the business or government agency that is licensed, and all their employees are covered by that license. They also employ their own engineers and technicians to make sure everything is set up and works correctly. With CB Radio (an American invention) and FRS walkie-talkie radios, the equipment is licensed and not the operator. Since operator is assumed to be unskilled, and most are, so they are forbidden to make changes or adjustments to the equipment. GMRS and MURS radios require the owner/user to pay the FCC for a license. And in most cases these channels (CB, FRS, MURS and GMRS) are not legal to use in other countries; 27 MHz CB has become common in many other parts of the world.(whether legally or illegally) but it is strictly illegal for US CBers to make DX contacts to CB operators outside the USA. You will need to earn (and pay for) an Amateur Radio license if you want to do that.