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  1. 1. Hoe MP3 Music Files Work About FTP About MP3 About Copyright About CD Group B Hoe 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. Hoe MP3 Music Files Work – p.2/9
  3. 3. FTP FTP is also often used as an application component to automatically transfer files for program internal functions. FTP can be used with user-based password authentication or with anonymous user access. The Trivial File Transfer Protocol (TFTP) is a similar, but simplified, not interoperable, and unauthenticated version of FTP. Hoe 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 Hoe 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. Hoe MP3 Music Files Work – p.5/9
  6. 6. Copyright An example of the intent of copyright, as expressed in the United States Constitution, is "To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries". Copyright has been internationally standardized, lasting between fifty to a hundred years from the author’s death, or a shorter period for anonymous or corporate authorship. Some jurisdictions have required formalities to establishing copyright, but most recognize copyright in any completed work, without formal registration. Generally, copyright is enforced as a civil matter, though some jurisdictions do apply criminal sanctions. Hoe 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. Hoe MP3 Music Files Work – p.7/9
  8. 8. CD The technology was later adapted and expanded to include data storage CD-ROM, write-once audio and data storage CD-R, rewritable media CD-RW, Video Compact Discs (VCD), Super Video Compact Discs (SVCD), PhotoCD, PictureCD, CD-i, and Enhanced CD. 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 of CD audio, CD-ROM, and CD-R reached about 30 bil- lion discs. By 2007, 200 billion CDs had been sold worldwide. Hoe 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/ Hoe MP3 Music Files Work – p.9/9

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