They may be more attractive to broadcasters because they allow greater control.” “Peer-to-peer is a good way to get around centralisation,” he explains, “but there are halfway houses like having multiple caches of material, locally and regionally. Tribler is one of many experiments by researchers and corporations around the world, Hutchison points out, and it may not prove to be the most popular for future video distribution. “It is clear that in the future there will be a greater variety and volume of media to consume, requiring different ways of distributing it,” says David Hutchison, who works on alternative methods of media distribution at Lancaster University, UK. The researchers say that, in future versions, the value of bandwidth will not be fixed but will be determined by a ‘trust’ ranking earned by each user from other users. Tribler offers users more control over their own bandwidth, while still encouraging sharing. These programs often prevent leeching by forcing users to upload constantly, which can be a problem for those who may be charged extra for using extra bandwidth. For example the BBC’s iPlayer is built on top of a peer-to-peer network. Some television stations and other companies are already experimenting with peer-to-peer content distribution. “Our network-based system already allows a group of ‘friends’ to pool their collective upload ‘reserve’ to slash download times,” explains Johan Pouwelse of the Delft team. Tribler also has social features, allowing people to earn and spend their credit together. The work is part of an ongoing research project investigating ways to distribute video content via the web. The latest version of Tribler was created by Parkes with colleagues at Harvard and researchers from Delft University of Technology and Vrije Universiteit, Amsterdam, both in the Netherlands. Parkes told New Scientist that he believes peer-to-peer will eventually replace existing methods of distributing video, including television. He think that peer-to-peer networks will help meet the growing demand for TV and video content online. “We are driven by the application of video-on-demand,” says David Parkes of Harvard University, US.
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