Friðrik Heiðar Ásmundsson Herwig Lejsek Kristleifur Daðason Björn Þór Jónsson Laurent Amsaleg Videntifier<sup>TM</sup> forensic: robust and efficient detection of illegal multimedia. 999-1000 2009 ACM Multimedia http://doi.acm.org/10.1145/1631272.1631488 conf/mm/2009 db/conf/mm/mm2009.html#AsmundssonLDJA09