Audio trick lets authorities watch the movie pirates

 作者:穆衾     |      日期:2019-03-09 05:20:01
DIGITAL watermarks built into movies now make it possible to identify the seat a video pirate was sitting in when they made an illegal camcorder copy. “Audio watermarks tell you how far the pirate is from the cinema’s speakers, even identifying the seat” Cheap copies of major movies such as Slumdog Millionaire (pictured) hit the streets as soon as the film is out. But now Noboru Babaguchi of Osaka University in Japan and colleagues claim that if you know which cinema a pirate operates from,