Remix culture is a society that allows and encourages derivative works, which is a creation that includes existing copyright protected works and with changes to it, by combining or editing existing materials to produce a new product. A remix culture would be, by default, permissive efforts to improve upon, change, integrate, or otherwise remix the work of copyright holders. Progress and wealth creation of a culture is fundamentally tied to remixing.
RiP!: A Remix Manifesto is an open source documentary film about "the changing concept of copyright directed by Brett Gaylor.

The documentary film features the collaborative remix work of hundreds of people who have contributed to the Open Source Cinema website, helping to create the "world's first open source documentary" as Gaylor put it. The project's working title was Basement Tapes, but it was renamed RiP!: A Remix Manifesto prior to release. Gaylor encourages more people to create their own remixes from this movie, using media available from the Open Source Cinema website, or other websites like YouTube, Flickr, Hulu.
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Gregg Michael Gillis, better known by his stage name Girl Talk is an American musician specializing in mashups and digital sampling.

He produces mashup-style remixes, in which he uses often a dozen or more unauthorized samples from different songs to create a mashup. The New York Times Magazine has called his releases "a lawsuit waiting to happen," a criticism that Gillis has attributed to mainstream media that wants "to create controversy where it doesn't really exist," citing fair use as a legal backbone for his sampling practices.
The image closest to the left is that of Lawrence Lessig. Featured in the film he is an academic and also a political activist not to mention a professor at a law school.

He is a key figure in the remix culture as he is a spokesperson for reduced legal restrictions on copyright and trademarks. Not to mention he is also the founder of the creative commons license.