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Web Presen

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Web Presen

  1. 1. How MP3 Music Files Work About FTP About MP3 About Copyright About CD Group B How MP3 Music Files Work – p.1/9
  2. 2. About FTP • File Transfer Protocol (FTP) is a standard network protocol used to exchange and manipulate files over an Internet Protocol computer network, such as the Internet. FTP is built on a client-server architecture and utilizes separate control and data connections between the client and server applications. Client applications were originally interactive command-line tools with a standardized command syntax, but graphical user interfaces have been developed for all desktop operating systems in use today. How MP3 Music Files Work – p.2/9
  3. 3. FTPFTP is also often used as an application component toautomatically transfer files for program internalfunctions. FTP can be used with user-based passwordauthentication or with anonymous user access. TheTrivial File Transfer Protocol (TFTP) is a similar, butsimplified, not interoperable, and unauthenticatedversion of FTP. How MP3 Music Files Work – p.3/9
  4. 4. About MP3 • MP3 is ... A patented digital audio encoding format using a form of lossy data compression A common audio format for consumer audio storage An audio-specific format that was designed by the Moving Picture Experts Group MP3 player How MP3 Music Files Work – p.4/9
  5. 5. About Copyright • Copyright gives the author of an original work exclusive right for a certain time period in relation to that work, including its publication, distribution and adaptation, after which time the work is said to enter the public domain. Copyright applies to any expressible form of an idea or information that is substantive and discrete and fixed in a medium. Some jurisdictions also recognize "moral rights" of the creator of a work, such as the right to be credited for the work. Copyright is described under the umbrella term intellectual property along with patents and trademarks. How MP3 Music Files Work – p.5/9
  6. 6. CopyrightAn example of the intent of copyright, as expressed inthe United States Constitution, is "To promote theProgress of Science and useful Arts, by securing forlimited Times to Authors and Inventors the exclusiveRight to their respective Writings and Discoveries".Copyright has been internationally standardized,lasting between fifty to a hundred years from theauthor’s death, or a shorter period for anonymous orcorporate authorship. Some jurisdictions haverequired formalities to establishing copyright, butmost recognize copyright in any completed work,without formal registration. Generally, copyright isenforced as a civil matter, though some jurisdictionsdo apply criminal sanctions. How MP3 Music Files Work – p.6/9
  7. 7. About CD • A Compact Disc (also known as a CD) is an optical disc used to store digital data. It was developed to store music at the start, but later it also allowed to store other kinds of data. CD have been available since October 1982. In 2009, they are still the standard physical medium for commercial audio recordings. Standard CDs have a diameter of 120 mm and can hold up to 80 minutes of audio (700 MB of data). The Mini CD has various diameters ranging from 60 to 80 mm; they are sometimes used for CD singles or device drivers, storing up to 24 minutes of audio. How MP3 Music Files Work – p.7/9
  8. 8. CDThe technology was later adapted and expanded toinclude data storage CD-ROM, write-once audio anddata storage CD-R, rewritable media CD-RW, VideoCompact Discs (VCD), Super Video Compact Discs(SVCD), PhotoCD, PictureCD, CD-i, and EnhancedCD. CD-ROMs and CD-Rs remain widely used tech-nologies in the computer industry. The CD and its ex-tensions are successful: in 2004, worldwide sales ofCD audio, CD-ROM, and CD-R reached about 30 bil-lion discs. By 2007, 200 billion CDs had been soldworldwide. How MP3 Music Files Work – p.8/9
  9. 9. Reference • http://ja.wikipedia.org/wiki/Wiki • http://chiebukuro.yahoo.co.jp/ • http://d.hatena.ne.jp/ • http://e-words.jp/ How MP3 Music Files Work – p.9/9

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