The operator of telecommunications services requiring a telecommunication network may use its own network and/or may lease it from other telecommunications network operators. A leased telecommunications network is basically for own use, but if it is sub-leased to another party, the party sub-leasing the network must obtain a license as a telecommunications network operator. Paragraph (3) Self-explanatory. Paragraph (4) Letter a Meant by operation of special telecommunications for individual purposes is the operation of telecommunications for individual needs, e.g. amateur radio and inter-population radio communications. Letter b Meant by operation of special telecommunications for the needs of government agencies is the operation of telecommunications to support the performance of the general tasks of certain authorities, e.g., departmental communications or regional government communications. Letter c Meant by operation of special telecommunications for special official body use is the operation of telecommunications to support the activities of the official body concerned, among others, navigation, aviation or meteorological activities. Letter d Meant by operation of special telecommunications for legal entities is the operation of telecommunications carried out by State-Owned Enterprises (BUMN), Regional-Owned Enterprises (BUMD), private business enterprises, or cooperatives, e.g. banking telecommunications, mining telecommunications or railway telecommunications. Paragraph 5 Self-explanatory.