From Walt Disney appropriating fairy tales to Led Zeppelin mimicking American bluesmen, culture is full of borrowed and modified ideas. Rip! A Remix Manifesto makes the case that copyright law is out of step with both technology and human nature, and that we must free ourselves by rewriting it. The film is a fun ride because of its cut-and-paste aesthetic and its focus on the music of Girl Talk, a.k.a. Greg Gillis, who’s guilty as hell: He builds wildly popular dance-floor mashups from other people’s music.