BitTorrent


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BitTorrent

(networking)
A popular, distributed form of peer-to-peer file sharing that enables a client program to fetch different parts of a file (a "torrent") from different sources in parallel. The system is designed to encourage users to make downloaded data available for others to upload. This is aided by a scheme for exchanging unique identifiers, commonly stored in ".torrent" files. A downloader who does not serve data to others is called a "leech". A "seed" is a computer that has a complete copy of a file, possibly the original.

The bittorrent.com site claims there are over 100 million users as of 2007-03-24.

Most of the data is copyright material like films or commercial software.

http://www.bittorrent.com/what-is-bittorrent.

BitTorrent

A popular protocol for sharing large files over the Internet, developed by Bram Cohen and released in 2001. In addition to Cohen's software, other BitTorrent client programs are available for all major platforms. There is no centralized server. Each downloading user becomes a source for another user who wants the same file. The BitTorrent client balances the load on the computer, because download speeds are faster than upload speeds.

Widely used for transferring pirated movies and software, BitTorrent, along with other file sharing systems, accounted for more than half of Internet traffic after the turn of the century. Since then, however, movie streaming from Netflix, YouTube and other legal sources became extremely popular, and BitTorrent traffic dropped dramatically.

Torrents
BitTorrent breaks large files into smaller ones. A "torrent" is a file of meta-data that describes the files and the servers that keep track of the BitTorrent peers that have the parts of the file. In practice, a file itself is also called a torrent.

Users Share the Load (Leechers and Seeds)
A "seed" is a BitTorrent client that has the file. A "leecher" is a BitTorrent client in the process of downloading, and a leecher thus becomes a seed for someone else. However, a "leech" refers to people who exit BitTorrent after downloading, thus preventing seeding to others. For more information, visit www.bittorrent.com.

File sharing systems have been architected in different ways as outlined in the following illustrations. See peer-to-peer network, Napster and KaZaA.








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ethical implications of the BitTorrent protocol and its use by potential
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New technology like BitTorrent makes piracy easier.
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