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This paper proposes the use of in-network caches (which the authors call Angels) to reduce the Minimum Distribution Time (MDT) of a file from a seeder - a node that possesses the file - to a set of leechers - nodes who are interested in downloading the file. An Angel is not a leecher in the sense that it is not interested in receiving the entire file, but rather it is interested in minimizing the MDT to all leechers, and as such uses its storage and up/down-link capacity to cache and forward parts of the file to other peers.
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