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BitTorrent (software)

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BitTorrent is a proprietary adwarecite-ref-5[5] BitTorrent client developed by Bram Cohen and Rainberry, Inc. used for uploading and downloading files via the BitTorrent protocol. BitTorrent was the first client written for the protocol. It is often nicknamed Mainline by developers denoting its official origins. Since version 6.0 the BitTorrent client has been a rebranded version of μTorrent. As a result, it is no longer open source. It is currently available for Microsoft Windows, Mac, Linux, iOS and Android. There are currently two versions of the software, "BitTorrent Classic" which inherits the historical version numbering, and "BitTorrent Web", which uses its own version numbering.

Contents

• History

• Features

• Release history

• BitTorrent DNA

• See also

• References

• External links

History

Programmer Bram Cohen designed the protocol in April 2001 and released a first implementation of the BitTorrent client on 2 July 2001.cite-ref-bc-1-1[1]cite-ref-6[6] It is now maintained by Cohen's company BitTorrent, Inc.

Prior to version 6.0, BitTorrent was written in Python, and was free software. Very early versions released prior to December 30, 2001, were released into the public domain without a license. Versions up to and including 3.4.2 were distributed under the MIT license. The source code for versions 4.x and 5.x was released under the BitTorrent Open Source License, a modified version of the Jabber Open Source License. Versions 4.0 and 5.3 were relicensed under the GPL.

Version 4.20 of the client was dubbed Allegro by BitTorrent Inc., in reference to protocol extensions developed by the company to accelerate download performance and ISP manageability.cite-ref-7[7]

Version 5.30 of the client which is snapshotted at Internet Archivecite-ref-8[8] is the latest open source version.

Since version 6.0, which was released on September 18, 2007, the BitTorrent client has been a rebranded version of μTorrent. It is no longer open source.cite-ref-9[9]

Features

The BitTorrent client enables a user to search for and download torrent files using a built-in search box ("Search for torrents") in the main window, which opens the BitTorrent torrent search engine page with the search results in the user's default web browser.

The current client includes a range of features, including multiple parallel downloads. BitTorrent has several statistical, tabular and graphical views that allow a user to see what events are happening in the background. A host of views offer information on the peers and seeds to which the user is connected, including how much data is being downloaded from each and to how much data is being uploaded by each. It has an automatic recovery system that checks all data that has been handled after an improper shutdown. It also intermediates peering between itself, source file servers ("trackers") and other clients, thereby yielding distribution efficiencies. The client also enables users to create and share torrent files.

Release history

Legend:

Unsupported

Supported

Latest version

Preview version

Future version

| Versions released into the public domai… | |

|---|---|

| Version | Release date |

| Unsupported: 1.0.0 | 2001 July 2 |

| Unsupported: 2.0.2 | 2001 August 10 |

| Unsupported: 2.1 | 2001 August 23 |

| Unsupported: 2.2 | 2001 September 2 |

| Unsupported: 2.3.1 | 2001 September 12 |

| Unsupported: 2.5 | 2001 October 23 |

| Unsupported: 2.6.1 | 2002 January 6 |

| Unsupported: 2.7 | 2002 April 29 |

| Unsupported: 2.8.0 | 2002 May 31 |

| Unsupported: 2.9 | 2002 July 2 |

| Unsupported: 3.0.1 | 2002 October 2 |

| Unsupported: 3.1 | 2003 January 2 |

| Unsupported: 3.2 | 2003 March 28 |

| Unsupported: 3.3 | 2003 September 24 |

| Unsupported: 3.4 | 2004 March 6 |

| Versions released into the public domai… | |

|---|---|

| Version | Changes |

| Unsupported: 1.0.0 | Initial release |

| Unsupported: 2.0.2 | The UI has been rewritten to be very si… |

| Unsupported: 2.1 | A fix for a serious problem which was k… |

| Unsupported: 2.2 | Several major changes were made to the… |

| Unsupported: 2.3.1 | This release has extensive user feedbac… |

| Unsupported: 2.5 | UI was rewritten. It is now completely… |

| Unsupported: 2.6.1 | For this release, the upload/download l… |

| Unsupported: 2.7 | Major performance enhancements, includi… |

| Unsupported: 2.8.0 | Huge internal performance improvements,… |

| Unsupported: 2.9 | This release contains major performance… |

| Unsupported: 3.0.1 | Minor cleanups, finalizing the protocol… |

| Unsupported: 3.1 | Massive performance improvements and so… |

| Unsupported: 3.2 | This release features massive performan… |

| Unsupported: 3.3 | Files now only get allocated as they're… |

| Unsupported: 3.4 | This version fixes bugs. The client no… |

| Versions released under BitTorrent Open… | |

|---|---|

| Version | Release date |

| Unsupported: 4.0.1 | 2005 April 6 |

| Unsupported: 4.1.0 | 2005 May 20 |

| Unsupported: 4.1.1 | 2005 May 25 |

| Unsupported: 4.0.4 | 2005 August 27 |

| Unsupported: 4.1.4 | 2005 August 27 |

| Unsupported: 4.1.6 | 2005 October 13 |

| Unsupported: 4.1.7 | 2005 November 3 |

| Unsupported: 4.1.8 | 2005 November 18 |

| Unsupported: 4.2.0 | 2005 November 22 |

| Unsupported: 4.2.1 | 2005 December 5 |

| Unsupported: 4.3.0 | 2005 December 5 |

| Unsupported: 4.3.2 | 2005 December 11 |

| Unsupported: 4.2.2 | 2005 December 21 |

| Unsupported: 4.3.3 | 2005 December 21 |

| Unsupported: 4.3.5 | 2006 January 9 |

| Unsupported: 4.3.6 | 2006 January 25 |

| Unsupported: 4.4.0 | 2006 February 1 |

| Unsupported: 4.9.2 | 2006 May 5 |

| Versions released under BitTorrent Open… | |

|---|---|

| Version | Changes |

| Unsupported: 4.0.1 | This release introduces an all new queu… |

| Unsupported: 4.1.0 | This release adds support for trackerle… |

| Unsupported: 4.1.1 | Many improvements to the trackerless op… |

| Unsupported: 4.0.4 | Trackerless Torrent files can now be id… |

| Unsupported: 4.1.4 | This release featured many improvements… |

| Unsupported: 4.1.6 | Donation nagging was removed. Global st… |

| Unsupported: 4.1.7 | The maximum upload rate slider was fixe… |

| Unsupported: 4.1.8 | Many small bugs were fixed, particularl… |

| Unsupported: 4.2.0 | This is the first release in the stable… |

| Unsupported: 4.2.1 | Selecting the language from the setting… |

| Unsupported: 4.3.0 | Massive code reorganization was done. G… |

| Unsupported: 4.3.2 | A command line option for testing auto-… |

| Unsupported: 4.2.2 | An "Invalid Menu Handle" error when upg… |

| Unsupported: 4.3.3 | Support for "--geometry" and for rememb… |

| Unsupported: 4.3.5 | The status light state machine was impr… |

| Unsupported: 4.3.6 | New icons were introduced. More fixes w… |

| Unsupported: 4.4.0 | All bugfixes and improvements from the… |

| Unsupported: 4.9.2 | This release features a completely new… |

| Versions released under a Proprietary L… | |

|---|---|

| Version | Release date |

| Unsupported: 6.0.0 | 2007 September 18 |

| Latest version: 7.4.3 | 2019 October 16 |

| Versions released under a Proprietary L… | |

|---|---|

| Version | Changes |

| Unsupported: 6.0.0 | BitTorrent client is now a rebranded ve… |

| Latest version: 7.4.3 | BitTorrent client comes in two versions… |

| "Web" Versions released under a Proprie… | |

|---|---|

| Version | Release date |

| Latest version: 1.2.8 | 2022 June 2 |

| "Web" Versions released under a Proprie… | |

|---|---|

| Version | Changes |

| Latest version: 1.2.8 | BitTorrent client comes in two versions… |

|---|---|---|---|

|---|---|---|---|

BitTorrent DNA

BitTorrent DNA (BitTorrent Delivery Network Accelerator) is a program designed to speed up the viewing of streaming video, downloading software (with or without the BitTorrent protocol) and playing online video games. It does so by distributing the end users' downloads between each other. In this way, the developers intend that content providers should take less load on their servers so the end users can receive the content faster.cite-ref-official-site-12-0[12] It runs in the background whenever the operating system is running.cite-ref-faq-13-0[13]

BitTorrent DNA is different from traditional BitTorrent in that it relies on publisher HTTP servers in order to provide publishers with guaranteed minimum data delivery rate, as well as give publishers control over content delivery (peers must connect to the origin server before they can reach other peers), and collect information about content delivery to share with the publisher. The quality of the file transfer is specified in terms of a long-term average bitrate for data and in terms of meeting deadlines when streaming. It also can give bandwidth to TCP and other traffic.

DNA is also different from traditional BitTorrent in that it is a UDP-based protocol that has replaced regular TCP-based bandwidth throttling with a much more sensitive bandwidth management technique.

Apart from being installed by third party websites and software companies, the program for end users is also installed when the official BitTorrent client is installed (starting with the rebranded version 6.0). However, it can be independently uninstalled.

The first version of the DNA made it possible to keep the DNA application installed and yet temporarily stopped until the next system restart (through the system's control panel, in Windows XPcite-ref-faq-13-1[13]). The DNA GUI was completely removed in the official BitTorrent version 6.1 and 6.1.1, but was re-introduced in version 6.1.2.

Since October, 2007 BitTorrent DNA has been offered by BitTorrent, Inc. as a commercial service that content providers can purchase (for an undisclosed price) and as a free background program for end users.cite-ref-official-site-12-1[12] Company President Ashwin Navin launched the product claiming that "Implementing BitTorrent DNA on top of legacy infrastructure has the profound impact of allowing our customers to deliver a better user experience, higher quality video, faster software downloads, all with the security and reliability of a managed service."cite-ref-14[14]

Navin in a podcast interview claimed that he attempted to sell BitTorrent DNA in January 2005. After finding that BitTorrent's brand was too polarizing for potential customers, they delayed the launch until after partnering with nearly 50 media companies in the BitTorrent Entertainment Network. That provided the company enough public validation to finally launch BitTorrent DNA two and half years later.cite-ref-15[15]

The service's first customer was the company Brightcove, that chose to use it to distribute streaming video files.cite-ref-16[16]cite-ref-17[17]

As of May 2009, the Asus support website is using BitTorrent DNA as an additional download method of their larger files in addition to their multiple somewhat internationally distributed HTTP servers and content delivery mirrors and other redirection facilities Asus has been known to rely in the present and past for their data delivery needs. Currently, a separate "P2P" icon is being presented for the DNA style downloads next to the "Global" and "Chinese" located servers as an example.cite-ref-18[18]