Template:Orphan Template:Infobox Software BitThief is a Java-based BitTorrent client designed to download from, but not upload to, BitTorrent networks. It is freeware and cross-platform. According to the BitThief homepage, it is intended as a proof of concept that there are weaknesses in the current BitTorrent protocol, which can be exploited by "cheating" BitTorrent clients (such as BitThief itself).
Wired called BitThief "straight-up nefarious and wrong." It has also attracted controversy with its now documented feature whereby it collects information about the torrent files being downloaded by the client, such as total number of pieces available, size of the pieces and a hash of the torrent hash.
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