Concept trailer videos , which involve collecting multiple pieces of film footage from one or multiple movies and editing them to create a new trailer . Trailer mashups are often created for a movie that does not exist now or to change the genre of an existing film . These are derivative works and as such , may find protection from copyright claims under the doctrine of fair use . The trailer mashups are not only a user – generated form of digital creativity but a way to create anticipation for future releases , working in tandem with current movie trailers . Movie trailers are designed to give minimal plot detail and to create hype and anticipation . Fan – made trailer mashups allow the audience to perform their own cinematic spin on current movie footage . This allows the trailer to focus on a specific actor or portion of the film . It could even change the plot or genre of the film entirely .
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