Data transmission controlling method and data transmission system

One kind of data transmitted from a data transmitter to a data transmission system of one or more data receivers, comprising: a data transmitter, for transmitting the encrypted data and the encrypted data; a receiver receiving the encrypted data; satellite links, the data transmitted from the data transmitter to a data receiver; and bidirectional communication channels, the data transmitted from the data transmitter to a data receiver, the data transmission capacity and having a small ratio of the satellite link. Satellite links the encrypted data transmitted from the data transmitter to the data receiver. At least the bidirectional communication channels for transmitting restrictive data transmission control information between the data transmitter and data receiver.