It also depends on where this happening. For instance, you don't need a license to drive a car inside your own private propriety. You need a license to drive it on public streets because society needs some assurance that you know what you are doing. So in many cases the laws and restrictions also happen in relation to a given scenario.
Generally speaking, even one machine can do something, it doesn't automatically mean another machine is allowed to do that.
For example you can drive car with a normal driving license, but not a truck. In some states you can own a pistol but no automatic rifle.