Kristleifur Daðason Herwig Lejsek Friðrik Heiðar Ásmundsson Björn Þór Jónsson Laurent Amsaleg Videntifier: identifying pirated videos in real-time. 471-472 2007 conf/mm/2007 ACM Multimedia http://doi.acm.org/10.1145/1291233.1291346 db/conf/mm/mm2007.html#DadasonLAJA07