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. BitTorrent (abbreviated to BT) is a communication for (P2P) which is used to distribute and over the. BitTorrent is one of the most common protocols for transferring large files, such as files containing or or files containing. Peer-to-peer networks have been estimated to collectively account for approximately 43% to 70% of all (depending on location) as of February 2009. In February 2013, BitTorrent was responsible for 3.35% of all worldwide, more than half of the 6% of total bandwidth dedicated to file sharing. To send or receive files, a person uses a on their -connected. A BitTorrent client is a computer program that implements the BitTorrent protocol.

Popular clients include,. Provide a list of files available for transfer, and allow the client to find peer users known as seeds who may transfer the files. Programmer, a former student, designed the protocol in April 2001 and released the first available version on 2 July 2001, and the most recent version in 2013. Are available for a variety of and including an official client released by In July 2018, the -based company has been acquired by, a company founded by and dedicated to accelerating the decentralization of the Internet through technology.

As of 2013, BitTorrent has 15–27 million concurrent users at any time. As of January 2012, BitTorrent is utilized by 150 million active users. Based on this figure, the total number of monthly BitTorrent users may be estimated to more than a quarter of a billion.

The middle computer is acting as a 'seed' to provide a file to the other computers which act as peers. The BitTorrent protocol can be used to reduce the server and network impact of distributing large files. Rather than downloading a file from a single source server, the BitTorrent protocol allows users to join a 'swarm' of hosts to upload to/download from each other simultaneously.

The protocol is an alternative to the older single source, multiple mirror sources technique for distributing data, and can work effectively over networks with lower. Using the BitTorrent protocol, several basic computers, such as home computers, can replace large servers while efficiently distributing files to many recipients.

This lower bandwidth usage also helps prevent large spikes in in a given area, keeping internet speeds higher for all users in general, regardless of whether or not they use the BitTorrent protocol. A user who wants to upload a file first creates a small torrent descriptor file that they distribute by conventional means (web, email, etc.). They then make the file itself available through a BitTorrent node acting as a. Those with the torrent descriptor file can give it to their own BitTorrent nodes, which—acting as or —download it by connecting to the seed and/or other peers (see diagram on the right).

The file being distributed is divided into called pieces. As each peer receives a new piece of the file, it becomes a source (of that piece) for other peers, relieving the original seed from having to send that piece to every computer or user wishing a copy. With BitTorrent, the task of distributing the file is shared by those who want it; it is entirely possible for the seed to send only a single copy of the file itself and eventually distribute to an unlimited number of peers.

Each piece is protected by a contained in the torrent descriptor. This ensures that any modification of the piece can be reliably detected, and thus prevents both accidental and malicious modifications of any of the pieces received at other nodes. If a node starts with an authentic copy of the torrent descriptor, it can verify the authenticity of the entire file it receives.

Pieces are typically downloaded non-sequentially and are rearranged into the correct order by the BitTorrent client, which monitors which pieces it needs, and which pieces it has and can upload to other peers. Pieces are of the same size throughout a single download (for example a 10 MB file may be transmitted as ten 1 MB pieces or as forty 256 KB pieces). Due to the nature of this approach, the download of any file can be halted at any time and be resumed at a later date, without the loss of previously downloaded information, which in turn makes BitTorrent particularly useful in the transfer of larger files.

This also enables the client to seek out readily available pieces and download them immediately, rather than halting the download and waiting for the next (and possibly unavailable) piece in line, which typically reduces the overall time of the download. Once a peer has downloaded a file completely, it becomes an additional seed. This eventual transition from peers to seeders determines the overall 'health' of the file (as determined by the number of times a file is available in its complete form).

The distributed nature of BitTorrent can lead to a spreading of a file throughout many peer computer nodes. As more peers join the swarm, the likelihood of a completely successful download by any particular node increases. Relative to traditional Internet distribution schemes, this permits a significant reduction in the original distributor's hardware and bandwidth resource costs. In general provide against system problems, reduce dependence on the original distributor and provide sources for the file which are generally and therefore harder to trace by those who would block distribution compared to the situation provided by limiting availability of the file to a fixed host machine (or even several).

One such example of BitTorrent being used to reduce the distribution cost of file transmission is in the client-server system. If a BOINC application needs to be updated (or merely sent to a user), it can do so with little impact on the BOINC server. Operation A BitTorrent client is any program that implements the BitTorrent protocol. Each client is capable of preparing, requesting, and transmitting any type of over a network, using the protocol. A peer is any computer running an instance of a client. To share a file or group of files, a peer first creates a small file called a ' (e.g.

This file contains about the files to be shared and about the, the computer that coordinates the file distribution. Peers that want to download the file must first obtain a torrent file for it and connect to the specified tracker, which tells them from which other peers to download the pieces of the file. Though both ultimately transfer files over a network, a BitTorrent download differs from a classic download (as is typical with an or request, for example) in several fundamental ways:.

BitTorrent makes many small data requests over different connections to different machines, while classic downloading is typically made via a single connection to a single machine. BitTorrent downloads in a random or in a 'rarest-first' approach that ensures high availability, while classic downloads are sequential. Taken together, these differences allow BitTorrent to achieve much lower cost to the content provider, much higher redundancy, and much greater resistance to abuse or to ' than regular. However, this protection, theoretically, comes at a cost: downloads can take time to rise to full speed because it may take time for enough peer connections to be established, and it may take time for a node to receive sufficient data to become an effective uploader. This contrasts with regular downloads (such as from an HTTP server, for example) that, while more vulnerable to overload and abuse, rise to full speed very quickly and maintain this speed throughout.

In general, BitTorrent's non-contiguous download methods have prevented it from supporting or 'streaming playback'. However, comments made by Bram Cohen in January 2007 suggest that streaming torrent downloads will soon be commonplace and ad supported streaming appears to be the result of those comments. In January 2011 Cohen demonstrated an early version of BitTorrent streaming, saying the feature was projected to be available by summer 2011. As of 2013, this new BitTorrent streaming protocol is available for beta testing. Creating and publishing torrents The peer distributing a data file treats the file as a number of identically sized pieces, usually with byte sizes of a power of 2, and typically between 32 kB and 16 MB each. The peer creates a for each piece, using the hash function, and records it in the torrent file.

Pieces with sizes greater than 512 kB will reduce the size of a torrent file for a very large payload, but is claimed to reduce the efficiency of the protocol. When another peer later receives a particular piece, the hash of the piece is compared to the recorded hash to test that the piece is error-free. Peers that provide a complete file are called seeders, and the peer providing the initial copy is called the initial seeder. The exact information contained in the torrent file depends on the version of the BitTorrent protocol.

By convention, the name of a torrent file has the suffix.torrent. Torrent files have an 'announce' section, which specifies the of the tracker, and an 'info' section, containing (suggested) names for the files, their lengths, the piece length used, and a for each piece, all of which are used by clients to verify the integrity of the data they receive.

Though SHA-1 has shown signs of cryptographic weakness, Bram Cohen did not initially consider the risk big enough for a backward incompatible change to, for example, BitTorrent is now preparing to move to SHA-256. Torrent files are typically published on websites or elsewhere, and registered with at least one tracker. The tracker maintains lists of the clients currently participating in the torrent. Alternatively, in a trackerless system (decentralized tracking) every peer acts as a tracker.

Azureus was the first BitTorrent client to implement such a system through the (DHT) method. An alternative and incompatible DHT system, known as, was released in the Mainline client three weeks later (though it had been in development since 2002) and subsequently adopted by the, and clients. After the DHT was adopted, a 'private' flag – analogous to the – was unofficially introduced, telling clients to restrict the use of decentralized tracking regardless of the user's desires. The flag is intentionally placed in the info section of the torrent so that it cannot be disabled or removed without changing the identity of the torrent. The purpose of the flag is to prevent torrents from being shared with clients that do not have access to the tracker. The flag was requested for inclusion in the official specification in August 2008, but has not been accepted yet. Clients that have ignored the private flag were banned by many trackers, discouraging the practice.

Downloading torrents and sharing files Users find a torrent of interest, by browsing the web or by other means, download it, and open it with a BitTorrent client. The client connects to the tracker(s) specified in the torrent file, from which it receives a list of peers currently transferring pieces of the file(s) specified in the torrent. The client connects to those peers to obtain the various pieces. If the swarm contains only the initial seeder, the client connects directly to it and begins to request pieces. Clients incorporate mechanisms to optimize their download and upload rates; for example they download pieces in a random order to increase the opportunity to exchange data, which is only possible if two peers have different pieces of the file. The effectiveness of this data exchange depends largely on the policies that clients use to determine to whom to send data.

Clients may prefer to send data to peers that send data back to them (a ' exchange scheme), which encourages fair trading. But strict policies often result in suboptimal situations, such as when newly joined peers are unable to receive any data because they don't have any pieces yet to trade themselves or when two peers with a good connection between them do not exchange data simply because neither of them takes the initiative. To counter these effects, the official BitTorrent client program uses a mechanism called 'optimistic unchoking', whereby the client reserves a portion of its available for sending pieces to random peers (not necessarily known good partners, so called preferred peers) in hopes of discovering even better partners and to ensure that newcomers get a chance to join the swarm.

Although 'swarming' scales well to tolerate 'flash crowds' for popular content, it is less useful for unpopular or content. Peers arriving after the initial rush might find the content unavailable and need to wait for the arrival of a 'seed' in order to complete their downloads. The seed arrival, in turn, may take long to happen (this is termed the 'seeder promotion problem'). Since maintaining seeds for unpopular content entails high bandwidth and administrative costs, this runs counter to the goals of publishers that value BitTorrent as a cheap alternative to a client-server approach. This occurs on a huge scale; measurements have shown that 38% of all new torrents become unavailable within the first month.

A strategy adopted by many publishers which significantly increases availability of unpopular content consists of bundling multiple files in a single swarm. More sophisticated solutions have also been proposed; generally, these use cross-torrent mechanisms through which multiple torrents can cooperate to better share content. Concerns BitTorrent does not, on its own, offer its users anonymity nor security. It is possible to obtain the of all current and possibly previous participants in a swarm from the tracker.

This may expose users with insecure systems to attacks. It may also, in rare cases, expose users to the risk of being sued, if they are distributing files without permission from the copyright holder(s). However, there are ways to promote anonymity; for example, the project layers privacy-preserving sharing mechanisms on top of the original BitTorrent protocol. A moderate degree of anonymity, enough to keep ISPs from giving the user trouble at least, can be achieved with which download the torrent files first to the companies' servers, followed by a direct download to the user.

Torrents can be downloaded with a high degree of anonymity by using services such as. Does not provide anonymity on BitTorrent, and its use is also discouraged (by blocking this type of connections) for performance reasons. Unlike Tor, i2p is designed to work with BitTorrent However, with i2p, torrents can only be downloaded from within the i2p network. This can be useful for users trying to avoid copyright complaints from their ISPs, maintaining privacy, or avoiding censorship.

Private trackers offer users a greater degree of privacy, compared to public trackers, but have the downside of a single centralized point of failure. Bridging between i2p and the clearnet is the only client that makes torrents available on and vice versa. It has a that connects to the i2p network.

If the user adds a torrent from i2p, it will be seeded on both i2p and the clearnet, and if a user adds a torrent from the clearnet, it will be seeded on both the clearnet and i2p. For this reason, torrents previously published only on i2p are made available to the entire Internet, and users of i2p can download any torrent on the Internet while maintaining the anonymity of i2p. Adoption A growing number of individuals and organizations are using BitTorrent to distribute their own or licensed works (e.g. Bands distributing digital files of their new songs). Independent adopters report that without using BitTorrent technology, and its dramatically reduced demands on their private networking hardware and bandwidth, they could not afford to distribute their files. Some uses of BitTorrent for file sharing may violate laws in some jurisdictions (see section).

Film, video, and music. has obtained a number of licenses from Hollywood studios for distributing popular content from their websites. Records releases tracks and videos via BitTorrent Inc. To distribute its 1000+ albums.

And (both bands associated with ) have extensively used torrents to distribute hundreds of demos and live videos. US band frequently distributes albums via BitTorrent. software is starting to integrate BitTorrent to help podcasters deal with the download demands of their MP3 'radio' programs. Specifically, and (formerly known as Democracy Player) support automatic processing of.torrent files from feeds.

Similarly, some BitTorrent clients, such as, are able to process and automatically download content found within them. purchases are provided via BitTorrent., a service which distributes 'free-to-share' movies and TV shows via BitTorrent. Broadcasters. In 2008, the became the first public broadcaster in North America to make a full show ( ) available for download using BitTorrent.

The (NRK) has since March 2008 experimented with bittorrent distribution, available online. Only selected works in which NRK owns all royalties are published. Responses have been very positive, and NRK is planning to offer more content. The Dutch broadcasting organization released four documentaries in 2009 and 2010 under a license using the content distribution feature of the tracker. Personal works. The 'Simple Storage Service' is a scalable Internet-based storage service with a simple interface, equipped with built-in BitTorrent support.

offers a simplified BitTorrent tracker to enable and non-technical users to host a tracker on their site. Blog Torrent also allows visitors to download a 'stub' loader, which acts as a BitTorrent client to download the desired file, allowing users without BitTorrent software to use the protocol. This is similar to the concept of a. Software. uses BitTorrent (via a proprietary client called the 'Blizzard Downloader', associated with the Blizzard 'BattleNet' network) to distribute content and patches for, and, including the games themselves.

uses BitTorrent in their popular titles, and to distribute game updates., maker of the space Simulation MMORPG, has announced that a new launcher will be released that is based on BitTorrent. Many software games, especially those whose large size makes them difficult to host due to bandwidth limits, extremely frequent downloads, and unpredictable changes in network traffic, will distribute instead a specialized, stripped down bittorrent client with enough functionality to download the game from the other running clients and the primary server (which is maintained in case not enough peers are available). Many major and projects encourage BitTorrent as well as conventional downloads of their products (via, etc.) to increase availability and to reduce load on their own servers, especially when dealing with larger files.

Government. The UK government used BitTorrent to distribute. Education. uses BitTorrent to distribute large scientific data sets to its researchers. Many universities that have distributed computing projects have used the BitTorrent functionality of the client-server system to reduce the bandwidth costs of distributing the client-side applications used to process the scientific data.

The uses BitTorrent to share their. Others. Facebook uses BitTorrent to distribute updates to Facebook servers. Twitter uses BitTorrent to distribute updates to Twitter servers. The added BitTorrent to its file download options for over 1.3 million existing files, and all newly uploaded files, in August 2012. This method is the fastest means of downloading media from the Archive. As of 2011, BitTorrent had 100 million users and a greater share of network bandwidth than and combined.

In early 2015, estimates that BitTorrent represents 20% of all broadband traffic. Routers that use (NAT) must maintain tables of source and destination IP addresses and ports.

Typical home routers are limited to about 2000 table entries while some more expensive routers have larger table capacities. BitTorrent frequently contacts 20–30 servers per second, rapidly filling the NAT tables. This is a known cause of some home routers ceasing to work correctly.

Indexing The BitTorrent protocol provides no way to index torrent files. As a result, a comparatively small number of websites have hosted a large majority of torrents, many linking to copyrighted works without the authorization of copyright holders, rendering those sites especially vulnerable to lawsuits. A BitTorrent index is a 'list of, which typically includes descriptions' and information about the torrent's content. Several types of websites support the discovery and distribution of data on the BitTorrent network. Public torrent-hosting sites such as allow users to search and download from their collection of torrent files. Users can typically also upload torrent files for content they wish to distribute.

Often, these sites also run for their hosted torrent files, but these two functions are not mutually dependent: a torrent file could be hosted on one site and tracked by another unrelated site. Private host/tracker sites operate like public ones except that they may restrict access to registered users and may also keep track of the amount of data each user uploads and downloads, in an attempt to reduce '. Allow the discovery of torrent files that are hosted and tracked on other sites; examples include,. These sites allow the user to ask for content meeting specific criteria (such as containing a given word or phrase) and retrieve a list of links to torrent files matching those criteria.

This list can often be sorted with respect to several criteria, relevance (seeders-leechers ratio) being one of the most popular and useful (due to the way the protocol behaves, the download bandwidth achievable is very sensitive to this value). Bram Cohen launched a BitTorrent search engine on that co-mingles licensed content with search results. Allow one to search several BitTorrent indices and search engines at once. Monitors the DHT network and indexes torrents via metadata exchange from peers. In the 2010s, some, alternatives to Torrent search engines have emerged, see below.

Technologies built on BitTorrent The BitTorrent protocol is still under development and may therefore still acquire new features and other enhancements such as improved efficiency. Distributed trackers On 2 May 2005, Azureus 2.3.0.0 (now known as ) was released, introducing support for 'trackerless' torrents through a system called the 'distributed database.' This system is a implementation which allows the client to use torrents that do not have a working. The following month, BitTorrent, Inc. Released version 4.2.0 of the Mainline BitTorrent client, which supported an alternative DHT implementation (popularly known as ', outlined in a draft on their website) that is incompatible with that of Azureus. Recent measurement shows users of Mainline DHT is from 10 million to 25 million, with a daily churn of at least 10 million.

Mainline DHT is arguably the largest realistic DHT in the world. Current versions of the official, and BitSpirit all share compatibility with Mainline DHT. Both DHT implementations are based on. As of version 3.0.5.0, Azureus also supports Mainline DHT in addition to its own distributed database through use of an optional application plugin.

This potentially allows the Azureus/Vuze client to reach a bigger swarm. Another idea that has surfaced in Vuze is that of virtual torrents. This idea is based on the distributed tracker approach and is used to describe some web resource. Currently, it is used for. It is implemented using a special messaging protocol and requires an appropriate plugin. Anatomic P2P is another approach, which uses a decentralized network of nodes that route traffic to dynamic trackers. Most BitTorrent clients also use (PEX) to gather peers in addition to.

While developers optimize their apps for 64-bit compatibility, Apple is notifying customers when they are using an app based on 32-bit technology. Below you will find more information about the alert and what the 64-bit transition means for you. Is 64 bit version for macos sierra. To ensure that the apps you purchase are as advanced as the Mac you run them on, all future Mac software will eventually be required to be 64-bit. Apple began the transition to 64-bit hardware and software technology for Mac over a decade ago, and is working with developers to transition their apps to 64-bit. At our Worldwide Developers Conference in 2018, Apple informed developers that macOS Mojave is the last version of macOS to run 32-bit apps. This is done via a one-time alert that appears when you launch a 32-bit app. In macOS Mojave, this alert appears once every 30 days when launching the app.

Peer exchange checks with known peers to see if they know of any other peers. With the 3.0.5.0 release of Vuze, all major BitTorrent clients now have compatible peer exchange. Web seeding Web 'seeding' was implemented in 2006 as the ability of BitTorrent clients to download torrent pieces from an HTTP source in addition to the 'swarm'. The advantage of this feature is that a website may distribute a torrent for a particular file or batch of files and make those files available for download from that same web server; this can simplify long-term seeding and through the use of existing, cheap, web hosting setups. In theory, this would make using BitTorrent almost as easy for a web publisher as creating a direct HTTP download.

In addition, it would allow the 'web seed' to be disabled if the swarm becomes too popular while still allowing the file to be readily available. This feature has two distinct specifications, both of which are supported by and the 26+ clients that use it. Hash web seeding The first was created by John 'TheSHAD0W' Hoffman, who created. This first specification requires running a web service that serves content by info-hash and piece number, rather than filename. HTTP web seeding The other specification is created by authors and can rely on a basic HTTP download space (using ). Other In September 2010, a new service named was launched which generates a torrent from any URL using webseeding. There are server-side solutions that provide initial seeding of the file from the webserver via standard BitTorrent protocol and when the number of external seeders reach a limit, they stop serving the file from the original source.

RSS feeds. Main article: A technique called combines feeds with the BitTorrent protocol to create a content delivery system, further simplifying and automating content distribution. Steve Gillmor explained the concept in a column for in December 2003. The discussion spread quickly among bloggers (Ernest Miller, etc.). In an article entitled Broadcatching with BitTorrent, Scott Raymond explained: I want RSS feeds of BitTorrent files.

A script would periodically check the feed for new items, and use them to start the download. Then, I could find a trusted publisher of an RSS feed, and 'subscribe' to all new episodes of the show, which would then start downloading automatically – like the 'season pass' feature of the. — Scott Raymond, scottraymond.net The RSS feed will track the content, while BitTorrent ensures content integrity with of all data, so feed subscribers will receive uncorrupted content. One of the first and popular software clients ( and ) for broadcatching is.

Other free software clients such as PenguinTV and KatchTV are also now supporting broadcatching. The BitTorrent web-service MoveDigital added the ability to make torrents available to any web application capable of parsing through its standard -based interface in 2006, though this has since been discontinued. Additionally, Torrenthut is developing a similar torrent that will provide the same features, and help bring the torrent community to standards. Alongside this release is a first application built using the API called PEP, which will parse any (RSS 2.0) feed and automatically create and seed a torrent for each enclosure found in that feed.

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Throttling and encryption. Main article: Since BitTorrent makes up a large proportion of total traffic, some have chosen to 'throttle' (slow down) BitTorrent transfers. For this reason, methods have been developed to disguise BitTorrent traffic in an attempt to thwart these efforts. Protocol header encrypt (PHE) and are features of some BitTorrent clients that attempt to make BitTorrent hard to detect and throttle. As of November 2015, MooPolice, Halite, and the latest official BitTorrent client (v6) support MSE/PE encryption. In September 2006 it was reported that some software could detect and throttle BitTorrent traffic masquerading as traffic.

Reports in August 2007 indicated that was preventing BitTorrent seeding by monitoring and interfering with the communication between peers. Protection against these efforts is provided by the client-tracker traffic via an to a point outside of the Comcast network. Comcast has more recently called a 'truce' with BitTorrent, Inc.

With the intention of shaping traffic in a protocol-agnostic manner. Questions about the ethics and legality of Comcast's behavior have led to renewed debate about. In general, although encryption can make it difficult to determine what is being shared, BitTorrent is vulnerable to. Thus, even with MSE/PE, it may be possible for an ISP to recognize BitTorrent and also to determine that a system is no longer downloading but only uploading data, and terminate its connection by injecting RST (reset flag) packets. Multitracker Another unofficial feature is an extension to the BitTorrent metadata format proposed by John Hoffman and implemented by several indexing websites.

It allows the use of multiple trackers per file, so if one tracker fails, others can continue to support file transfer. It is implemented in several clients, such as,. Trackers are placed in groups, or tiers, with a tracker randomly chosen from the top tier and tried, moving to the next tier if all the trackers in the top tier fail.

Torrents with multiple trackers can decrease the time it takes to download a file, but also have a few consequences:. Poorly implemented clients may contact multiple trackers, leading to more overhead-traffic. Torrents from closed trackers suddenly become downloadable by non-members, as they can connect to a seed via an open tracker. Decentralized keyword search Even with distributed trackers, a third party is still required to find a specific torrent. This is usually done in the form of a hyperlink from the website of the content owner or through indexing websites like,.

The BitTorrent client is the first to incorporate decentralized search capabilities. With Tribler, users can find.torrent files that are hosted among other peers, instead of on a centralized index sites. It adds such an ability to the BitTorrent protocol using a, somewhat similar to the network which was shut down in 2005. The software includes the ability to recommend content as well. After a dozen downloads the Tribler software can roughly estimate the download taste of the user and recommend additional content. In May 2007, researches at published a paper proposing a new approach to searching a peer-to-peer network for inexact strings, which could replace the functionality of a central indexing site. A year later, the same team implemented the system as a plugin for called Cubit and published a follow-up paper reporting its success.

A somewhat similar facility but with a slightly different approach is provided by the client through its 'Torrent Exchange' feature. Whenever two peers using BitComet (with Torrent Exchange enabled) connect to each other they exchange lists of all the torrents (name and info-hash) they have in the Torrent Share storage (torrent files which were previously downloaded and for which the user chose to enable sharing by Torrent Exchange). Thus each client builds up a list of all the torrents shared by the peers it connected to in the current session (or it can even maintain the list between sessions if instructed). At any time the user can search into that Torrent Collection list for a certain torrent and sort the list by categories. When the user chooses to download a torrent from that list, the.torrent file is automatically searched for (by info-hash value) in the and when found it is downloaded by the querying client which can after that create and initiate a downloading task. Implementations. Main article: The BitTorrent specification is free to use and many clients are, so BitTorrent clients have been created for all common using a variety of.

The, and are some of the most popular clients. Some BitTorrent implementations such as and are designed to run as servers. For example, this can be used to centralize file sharing on a single dedicated server which users share access to on the network.

Server-oriented BitTorrent implementations can also be hosted by at facilities with high bandwidth Internet connectivity (e.g., a datacenter) which can provide dramatic speed benefits over using BitTorrent from a regular home broadband connection. Services such as can download files on BitTorrent for the user, allowing them to download the entire file by once it is finished.

The supports BitTorrent, as does. Allows users to download Torrents directly from their browser using a. An increasing number of hardware devices are being made to support BitTorrent. These include routers and NAS devices containing BitTorrent-capable firmware like. Proprietary versions of the protocol which implement, encryption, and authentication are found within managed clients such as. Development An unimplemented (as of February 2008 ) unofficial feature is (SET), a technique for improving the speed at which peer-to-peer file sharing and content distribution systems can share data.

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SET, proposed by researchers Pucha, Andersen, and Kaminsky, works by spotting chunks of identical data in files that are an exact or near match to the one needed and transferring these data to the client if the 'exact' data are not present. Their experiments suggested that SET will help greatly with less popular files, but not as much for popular data, where many peers are already downloading it. Andersen believes that this technique could be immediately used by developers with the BitTorrent file sharing system. As of December 2008, BitTorrent, Inc. Is working with Oversi on new Policy Discover Protocols that query the ISP for capabilities and network architecture information. Oversi's ISP hosted NetEnhancer box is designed to 'improve peer selection' by helping peers find local nodes, improving download speeds while reducing the loads into and out of the ISP's network.

Legal issues. Main article: Although the protocol itself is perfectly legal, problems stem from using the protocol to traffic copyright infringing works. There has been much controversy over the use of BitTorrent trackers. BitTorrent metafiles themselves do not store file contents. Whether the publishers of BitTorrent metafiles violate copyrights by linking to copyrighted works without the authorization of copyright holders is controversial. Various jurisdictions have pursued legal action against websites that host BitTorrent trackers.

High-profile examples include the closing of,. Torrent website, formed by a Swedish group, is noted for the 'legal' section of its website in which letters and replies on the subject of alleged copyright infringements are publicly displayed. On 31 May 2006, The Pirate Bay's servers in Sweden were raided by Swedish police on allegations by the MPAA of copyright infringement; however, the tracker was up and running again three days later. In the study used to value NBC Universal in its merger with Comcast, Envisional examined the 10,000 torrent swarms managed by PublicBT which had the most active downloaders. After excluding pornographic and unidentifiable content, it was found that only one swarm offered legitimate content.

In the United States, more than 200,000 people have been sued for filesharing on BitTorrent since 2010. On 30 April 2012, the UK High Court ordered five ISPs to block BitTorrent search engine The Pirate Bay. Security problems BitTorrent implementations often use for their communication. To achieve high bandwidths, the underlying protocol used is, which allows spoofing of source addresses of internet traffic. This can be used for, where users running BitTorrent clients act as amplifiers for an attack at another service. Challenges ', are those users who download more than they share.

As BitTorrent is a collaborative distributed platform, there is a section of the community that wants solutions to punish and discourage such behaviour. Malware Several studies on BitTorrent have indicated that there exist files, containing, available for download via BitTorrent. In particular, one small sample indicated that 18% of all executable programs available for download contained malware. Another study claims that as much as 14.5% of BitTorrent downloads contain, and that BitTorrent was used as the distribution mechanism for 47% of all zero-day malware they have found. BitErrant attack Due to SHA1 collisions, an attacker can alter the execution path of the executable by serving altered chunks when the victim is downloading the executable using the BitTorrent protocol. Criticism of BitErrant attack Despite the fact that a proof of concept exists, the attack may succeed in very limited cases: such as small chunk size (32kB).

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By selecting larger chunks (i.e. 256kB) the amount of resources required to find SHA1 collision is tremendous, which makes the attack virtually impossible. See also.