17. Cryptology services: any service which, with secret codes, is intended to transform information or clear signals into information or signals which are unintelligible to third parties, or the reverse, using means, equipment or software designed for that purpose. 18. Radiocommunication: any telecommunication carried out using electromagnetic waves of a frequency below 300 gigahertz, broadcast in space without any artificial guide. 19. Radiobroadcasting: any radiocommunication whose broadcasts are destined for direct reception by the public. 20. Private network: a telecommunications network reserved for private use or shared by a closed group of users. The private network shall be "independent" when it spans several estates, sites or private property, and therefore the public property of the State, including hertzian property, and/or sites or private property of third parties. The private network shall be "internal" when it is completely established over a single estate, a single site or a single private property, without encroaching on the public property of the State, including radio waves, or on the property of third parties. 21. Public network: all telecommunications networks set up or used for the benefit of the public. 22. Telecommunications network: any installation or set of installations for transmitting or channelling telecommunications signals, or for the exchange of command and management information associated with such signals, between the terminal points of the network. 23. Value-added service: any additional service to basic telecommunications services. Some of these value-added services are said to be "telematic" when in most cases, they combine the simple transmission of data with the processing of the transported data. 24. Data transmission service: a service for the mere transmission of data without any additional processing. 25. Basic telecommunications services: international, national and local telecommunications services for telephone communication between fixed points, facsimile, telex and telegraph. 26. Telecommunications service: any service involving the signals transmission or conduction, or a combination of the two, using telecommunication means, excluding audiovisual communication, sound broadcasting and television broadcasting services, provided using hertzian frequencies or distributed by cable. 27. Telex service: the use, for commercial purposes, of the direct transfer of type-written messages through an exchange of telegraphic signals between users at the terminal points of a telecommunications network. 28. Universal service: a basic telecommunications service provided all over the national territory under defined conditions and in accordance with modalities provided for by this law and the legal and statutory instruments in force to guarantee the basic requirements. 29. GMPCS (Global Mobile Personal Communication System) system: any satellite system which is fixed or mobile, uses a wide or narrow band, is global or regional, geoestationary or nongeoestationary, existing or projected, that provides telecommunications services directly or indirectly to end-users from a constellation of satellites. 30. Telecommunication: any transmission, emission or reception of signs, signals, script, images, sound or any other information by wire, optic fibre, radiofrequency or any other electromagnetic system. 31. Television broadcasting: transmission or retransmission of radiobradcast signals received by satellite or by an appropriate ground system, or produced locally, to subscribers through a cable or radio network.