the present invention relates to a method for retransmission of lost data , a receiving device operating according to the invented method and a retransmission server . in the absence of a unique identifier per data packet or data frame , there is obviously a problem to directly identify a specific data packet , data block or data frame in the stream and retransmission can &# 39 ; t take place with current technologies . the object of the present invention is to offer a retransmission method and means for making said retransmission of missing data packets possible in the absence of a unique identifier .