Simitopoulos, Dimitrios  and Tsaftaris, Sotirios A. and Boulgouris, Nikolaos and Strintzis, Michael  Compressed-domain video watermarking of MPEG streams.   In:  IEEE International Conference on Multimedia and Expo, 2002. ICME '02.   IEEE,  569 - 572 vol.1.  ISBN 0-7803-7304-9       (2002)