A movie about the art form of mash-ups that features mash-ups of the movie within the movie itself? We’re pretty sure we just heard the space/time continuum begin to rip at the prospect. Director Brett Gaylor attempts to make sense of the intellectual property laws that allow some musicians to steal riffs and make millions (Led Zeppelin, the Stones), while other, more cutting-edge musicians are branded as criminals (Girl Talk), and the end result is “Rip! A Remix Manifesto,” a wake-up call to Big Media that, whether they like or not, the rules have changed. Gaylor declares Walt Disney to be the first mash-up artist, and absolutely pummels publishing company Warner-Chappell for refusing to let “Happy Birthday” to enter the public domain (it’s true: if you sing that song, ever, you’re a thief), and for suing Radiohead fans for mash-ups once W-C acquired the rights to In Rainbows. Truth be told, the doc isn’t quite a five-star affair – we were frankly surprised that he didn’t mention when John Fogerty was sued for ripping off one of his own songs – but we’re giving it an extra star because “Rip!” addresses an issue that needs to be sorted out sooner rather than later. Indeed, one could argue that the music industry’s very survival depends on it.