Abstract: An apparatus and a method for real-time data communication includes a sending client terminal (10) and at least one receiving client terminal (20), the client terminals being provided with protective elements (12, 22), the real-time data communication transmitted via an intermediate distribution server (30). Moreover, the protective elements (12, 22) are provided with a network translation unit for mapping one internally accessible network destination address with a corresponding externally accessible network destination address. The sending client terminal (10) and the intermediate distribution server (30) are adapted to exchange information between one another about the current mapping of internally and externally accessible destination addresses for the server to reach the receiving client terminal (20) with real-time data communication.

Abstract: A method and system for transmitting a media stream of data from a sending client terminal to a receiving client terminal, the terminals being arranged in a protected computer environment including at least one protective unit in association with a data forwarding element. The protective unit is intended to protect the receiving client terminal from data transmitted from unauthorized sending clients. The method includes: transmitting authorization data from the receiving client terminal to sending client terminal via the protective unit for instructing the unit to allow return of a media stream from the sending client terminal to the receiving client terminal during a predetermined period of time. Moreover, the method includes the step of: the receiving client terminal is adapted to independently transmit authorisation data via the protective unit at shorter intervals than the predetermined period of time for maintaining the allow return mode of the protective unit.