file sharing

computer science

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major reference

  • In Internet: File sharing

    College students have been at the leading edge of the growing awareness of the centrality of intellectual property in a digital age. When American college student Shawn Fanning invented Napster in 1999, he set in motion an ongoing legal battle over digital rights.…

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intellectual-property law

  • In intellectual-property law: Trends

    …and thus less legally vulnerable, file-sharing systems. Partly as a result, sales of authorized copies of recorded music began to decline, and the recording industry attempted to develop procedures to enable it to profit from Internet file sharing.

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Napster

  • In Napster

    file-sharing computer service created by American college student Shawn Fanning in 1999. Napster allowed users to share, over the Internet, electronic copies of music stored on their personal computers. The file sharing that resulted set in motion a legal battle over digital rights and the…

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  • Sean Parker photographed in 2011
    In Sean Parker

    …American entrepreneur who cofounded the file-sharing service Napster in 1999 and was the first president (2004–05) of the social networking site Facebook.

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piracy

  • In piracy: MP3 and P2P networks

    …led to the development of file-sharing networks, such as Napster, that relied on peer-to-peer (P2P) software for distributing songs. Although the Recording Industry Association of America (RIAA) succeeded in shutting down Napster, which had facilitated billions of song transfers over the Internet from 1999 to 2001, newer P2P programs became…

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rock music

  • The Rolling Stones
    In rock: Rock as a reflection of social and cultural change

    …an Internet company whose “peer-to-peer” file-sharing program allowed users to download music for free. Artists lined up on either side of the issue. In the end Bertelsmann became the majority owner of Napster, anxious to provide a fee-based service. But this was only the beginning of what became an ongoing…

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The Pirate Bay

  • In The Pirate Bay

    >file-sharing Web site founded in 2003 by the Swedish anti-copyright group Piratbyrån (“Bureau of Piracy”). The Pirate Bay is the most popular site in the world to use the BitTorrent protocol that allows the distribution of very large files such as those containing movies and…

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types of cybercrime

  • In cybercrime: File sharing and piracy

    Through the 1990s, sales of compact discs (CDs) were the major source of revenue for recording companies. Although piracy—that is, the illegal duplication of copyrighted materials—had always been a problem, especially in the Far East, the proliferation on college campuses of…

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JPEG

technology
Also known as: Joint Photographic Experts Group
In full:
Joint Photographic Experts Group

JPEG, computer graphics file format.

In 1983 researchers with the International Organization for Standardization (ISO) started working on ways to add photo-quality graphics to the text-only computer terminal screens of the day. Three years later, the Joint Photographic Experts Group (JPEG) was formed to create a new standard, named the JPEG standard, that used data compression to keep graphics files small. The JPEG standard works by averaging colour variation and discarding what the human eye cannot see, a process known as “lossy” compression. Depending on the level of compression, it is possible to compress an image by a factor of 100 to 1, though there may be some loss of quality at the compression limits. Factors of 20 to 1 are easily done, however, and the loss of quality is practically invisible to the human eye. In comparison, the lossless graphics interchange format (GIF) compresses by only between 4 to 1 and 10 to 1.

JPEGs are widely used on the World Wide Web and in digital cameras. Progressive JPEGs, a specific type of JPEG that initially shows a low-quality image that improves over a few passes, are especially useful for Internet users with slower connections. Many digital cameras store images as JPEGs, allowing more pictures to fit on a memory card, though cameras aimed at more-serious photographers can store uncompressed images, which retain more detail. JPEG files also have the ability to carry exchangeable image file format (EXIF) information that stores details about when a picture was taken and even settings such as exposure and shutter speed. JPEG files typically end in the extension “.jpeg” or “.jpg.”

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The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Erik Gregersen.