While BitTorrent has been successfully used in peer-to-peer content distribution, its performance is limited by the fact that typical internet users have much lower upload bandwidths than download bandwidths. This asymmetry in bandwidth results in the overall average download speed of a BitTorrent-like file download system to be bottle-necked by the much lower upload capacity. This motivates the approach in which it utilize idle users' spare upload capacity to significantly improve the download speed beyond what can be achieved in a conventional BitTorrent network.
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