Whoever wants to transmit or receive radio signals in Europe must comply with the relevant European directives governing the approval of radio equipment. These directives are developed in close cooperation between the European Commission as a body taking an active part in political decision-making, the European Electronic Communications Committee (ECC) within the European Conference of Postal and Telecommunications Administrations (CEPT), both of them guardians of the ever more valuable frequency resources, and the European Telecommunications Standards Institute (ETSI).