Depends on the license. If it’s a paid license there are limitations per the license whether the license is for one, two or three machines.
If you are asking about the “free” license, then it’s one computer per license/registration. No matter the number of computers you
have running the free version, each must be registered separately. If the machines are in a business environment then they must
have the proper business license. Schools and certain charities are exempt from the need of a business license.