|  |  Legal controversy 
 
 
 Under US law, "the Betamax decision" case holds that copying 
                  "technologies" are not inherently illegal, if substantial non-infringing 
                  use can be made of them. This decision, predating the widespread 
                  use of the Internet applies to most data networks, including 
                  peer-to-peer networks, since distribution of correctly licensed 
                  files can be performed. These non-infringing uses include sending 
                  open source software, public domain files and out of copyright 
                  works. Other jurisdictions tend to view the situation in somewhat 
                  similar ways.
 
 In practice, many, often most, of the files shared on peer-to-peer 
                  networks are copies of copyrighted popular music and movies 
                  in wide variety of formats (MP3, MPEG, RM, etc.) Sharing of 
                  these copies among strangers is illegal in most jurisdictions. 
                  This has led many observers, including most media companies 
                  and some peer-to-peer advocates, to conclude that the networks 
                  themselves pose grave threats to the established distribution 
                  model.
 
 The research that attempts to measure actual monetary loss has 
                  been somewhat equivocal. Whilst on paper the existence of these 
                  networks results in large losses, the actual income does not 
                  seem to have changed much since these networks started up. Whether 
                  the threat is real or not, both the RIAA and the MPAA now spend 
                  large amounts of money attempting to lobby lawmakers for the 
                  creation of new laws, and some copyright owners pay companies 
                  to help legally challenge users engaging in illegal sharing 
                  of their material.
 
 In spite of the Betamax decision, peer-to-peer networks themselves 
                  have been targeted by the representatives of those artists and 
                  organizations who license their creative works, including industry 
                  trade organizations such as the RIAA and MPAA as a potential 
                  threat. The Napster service was shut down by an RIAA lawsuit. 
                  In this case, Napster had been deliberately marketed as a way 
                  to distribute audio files without permission from the copyright 
                  owners. In Grokster the U.S. Supreme Court again held illegal 
                  the services of Grokster which included allowing users to illegally 
                  share copyrighted music.
 
 As actions to defend copyright infringement by media companies 
                  expand, the networks have quickly adapted and constantly become 
                  both technologically and legally more difficult to dismantle. 
                  This has caused the users that are actually breaking the law 
                  to become targets, because whilst the underlying technology 
                  may be legal, the abuse of it by individuals redistributing 
                  content in a copyright infringing way is clearly not.
 
 Anonymous peer-to-peer networks allow for distribution of material 
                  - legal or not - with little or no legal accountability across 
                  a wide variety of jurisdictions. Many profess that this will 
                  lead to greater or easier trading of illegal material and even 
                  (as some suggest) facilitate terrorism, and call for its regulation 
                  on those grounds.
 
 Others counter that the potential for illegal uses should not 
                  prevent the technology from being used for legal purposes, that 
                  the presumption of innocence must apply, and that non peer-to-peer 
                  technologies like e-mail, which also possess anonymizing services, 
                  have similar capabilities.
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