Patent ID: 7797755

Claim:
A method for securing the transfer of a data stream from a sender device to at least one receiver device, through a network comprising a plurality of nodes, the sender device being connected to an input node, each receiver device being connected to a respective output node, wherein the method comprises the following steps: a) transmitting the data stream from the sender device to each receiver device via the input node and the respective output node to which each receiver device is connected, the data stream being encrypted from the sender device to the input node with a first key; b) informing each output node by the input node that transmitting or maintaining a transmission of the data stream in clear form from the input node to each respective output node necessitates authentication of each respective output node; c) receiving, by the input node, at least one authentication request sent by at least one output node; d) authenticating, by the input node, each output node from which an authentication request has been received; and e) transmitting the data stream in clear form to, at most, the authenticated output nodes and stopping the transmission of the data stream to the other output nodes.