1. D iocesan B oys’ S chool L 6 ASL C omputer A pplications R eading S cheme B it T orrent C han C hun H o L 6A (1)

2. C ontents  Introduction  Evolution of BitTorrent  Network Model  How BitTorrent works?  Components  Words of BitTorrent  Development & Problems  News  Conclusion  Reference

3. I ntroduction What is BitTorrent?  For short “BT”  A protocol designed for transferring files  Created in 2001  By Bram Cohen

4. E volution o f B it T orrent 2001 – solve communication problem of internet 2003 – global revolution in file distribution Nowadays – a valuable platform of publishing, searching, sharing and communicating

5. N etwork M odel There are 2 fundamental network models: Client – server model Peer-to-peer model  One-to-one connections and communication channels are established  No server Client – server model  Similar to star topology in shape  Central server

6. H ow does B itTorrent w ork ? Tracker  Peer-to-peer in nature  Users efficiency  Managed by a central server called tracker  Upload and download simultaneously

7. C omponents There are 3 main components: 1. Protocol 2. Client 3. Search  A mean to manage the distribution of data  Enable other users to search, download, share, etc.  Obtain or retrieve information

8. W ords o f B it T orrent These are the words associated with BitTorrent and their meanings: 1. Torrent small metadata file 2. Peer another computer on the internet

9. W ords o f B it T orrent 3. Seed a computer that has a complete copy of torrent 4. Tracker a unique server for coordinating clients 5. Downloading receiving data 6. Uploading sending data

10. D evelopment & P roblems Rapid information technology development Popularity of computer rises sharply. Number of BitTorrent user increases Faster and more efficient transmission and sharing of files, video, songs, etc. Distributing of copyrighted content without authorization Illegal actions taken by groups of irresponsible people Serious problem of copyright

11. N ews As the problem of copyright is seriously concerned, a 38-year-old HK BT user Chan Nai-ming ( 陳乃明, using the handle 古惑天皇 ) is arrested due to illegal distribution and uploading of “BT seed”.

12. C onclusion  Initially, BitTorrent was developed for our goods.  Illegal sharing and distribution cause great loss to publishing organizations  Respect Copyright

13. R eference  http://www.dessent.net/btfaq/#what http://www.dessent.net/btfaq/#what  http://www.bittorrent.com/about.myt http://www.bittorrent.com/about.myt  http://en.wikipedia.org/wiki/Bittorrent http://en.wikipedia.org/wiki/Bittorrent  http://www.bittorrent.com/index.html http://www.bittorrent.com/index.html  http://hk.news.yahoo.com/051107/12 /1ih8e.html http://hk.news.yahoo.com/051107/12 /1ih8e.html http://hk.news.yahoo.com/051107/12 /1ih8e.html

14. T he E nd