Content ID, YouTube's automated copyright infringement service, can automatically search for and block clips at the request of the copyright holder, but also has the ability to leave in place clips uploaded by users and serve ads with them; the revenue from the latter is shared with the content producers. Content ID also allows users who take copyrighted footage of a film such as "Downfall," a movie about Hitler's final days, and repurpose it within fair-use guidelines to petition to have their clips restored to YouTube.

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