The inventions shows how certain existing protocols can be enlarged/modified in order to guarantee an efficient, secure data transmission via transmission media/protocols, whereby message overhaul can occur. The invention relates to a method by means of which a message, which has been transmitted for at least the second time, is particularly marked by the transmitter. The message which is marked as transmitted for at least the second time is ignored by the receiver when said message has already been received or is new.
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