1. COS 125 DAY 8

2. Agenda  Assignment #2 Corrected 10 A’s  Capstone Projects Proposals (over) Due Missing 6 proposals  Today we will discuss Multimedia on the Internet and Begin Shopping and Doing Business on the Internet We complete the HITW text this week and then concentrate on Web Design (Castro text) for the rest of the semester  Assignments will get harder as the course progresses  Next Quiz is Feb 26 over the rest of HITW test 20 M/C, 4 Short essays, One extra Credit

3. Free Music File Sharing  Is it Legal? Moral? Ethical? Define your thoughts

4. Music & File Sharing  Hottest applications this decade  Forced the music Industry to “rethink” its distribution channels The problem  People buy CD and rip them to MP3s Not a Problem  People place these MP3 in a shareable locations Not a Problem  Other people copy the shared out MP3s Copyright violation! Buying a CD allows personal use and not redistribution  Who’s at fault?.. The person who made the MP3’s or the person that copied them? Open debate

5. Apple iPod response  Apple recognized a need for digital music No easy & legal way to obtain that music Developed a really easy to use music appliance  iPod Create iTunes to load music onto iPods  iPod lead to podcasting

6. iTunes  Digital jukebox for PCs  Music source iTunes Store (DRM protected) Personal owned CD’s  Listen to music on PCs or download to iPod  Can create CD’s (unless DRM protected)

7. Podcasting http://andywibbels.com/post/272

8. How KAZAA Works  KAZAA has two types of Computers PC’s that share out files SuperNodes that keep directories of “who has what” Any computer that has a Broadband connection can be a Supernode

9. How KAZAA works  After you download KAZAA and install You computer broadcasts looking for Supernodes When it find one it uploads your file information When you look for a specific file you “query” the supernode The supernodes tells your computer where you can find the file on someone's else computer You download the file from the other computer

10. Kazaa Licenses  You agree not to use the Software to: 2.1 Transmit or communicate any data that is unlawful, harmful, threatening, abusive, harassing, defamatory, vulgar, obscene, invasive of another's privacy, hateful, or racially, ethnically or otherwise objectionable; 2.2 Harm minors in any way; 2.3 Impersonate any person or entity or falsely state or otherwise misrepresent your affiliation with a person or entity; 2.4 Forge headers or otherwise manipulate identifiers in order to disguise the origin of any data transmitted to other users; 2.5 Transmit, access or communicate any data that you do not have a right to transmit under any law or under contractual or fiduciary relationships (such as inside information, proprietary and confidential information learned or disclosed as part of employment relationships or under non-disclosure agreements); 2.6 Transmit, access or communicate any data that infringes any patent, trademark, trade secret, copyright or other proprietary rights of any party; 2.7 Transmit or communicate any data that contains software viruses or any other computer code, files or programs designed to interrupt, destroy or limit the functionality of any computer software or hardware or telecommunications equipment;

11. Napster Index Server 2. Search Query 3. Response 1. Uploads List Of Available Files When Connects 4. Large P2P Download File List List of Available Files From All Current Clients Client PC

12. How BitTorrent Works  Downloads from more than one source (a swarm!)  A user searches for a particular Video or Music CD Freely available torrent clients Get a small “pointer file”  Address of tracker server  Information about all the “bits” of the downloads Tracker server informs client about the seed computers that have knowledge of all the parts of the file

13. Bit torrent technology http://en.wikipedia.org/wiki/BitTorrent_%28protocol%29

14. How Video on the Internet Works  Three methods of delivery Multicast (MBone) Streaming Video Videoconference  Requires webCam

15. How Streaming Video Works  Same as Streaming Audio  Streaming is playing and downloading a file at the same time As soon as enough of the file has been downloaded… the applications will begin to play the file and hope the rest gets there in time Demo from Learn The Net

16. Video Conferencing  Many Software solutions for Video Conferencing  NetMeeting built into Windows 2000 Windows XP Just add  WebCam  Microphone  Works on H.323

17. WebCams  Small Digital cameras Best ones work on USB 2.0 Avoid Parallel port versions  Used to create videos

18. Multicast and MBone  Video files and streams tend to be very large What happens when thousands of people want to see the same video at the same time Video 100MB * 10,000 viewers  We need 1000 GB of band width at the source of the video A better way?  Think of how cable TV works

19. Multicasting  What would happen if the server sent one copy of the video file to each location that had users and let the routers make individual copies for each user  Each multicast router copies the files and send copies to each network that requires the file  Source only has to send one file Multicast routers handle the individual users

20. Unicast ---------------------Multicast

21. Virtual Reality  3-D illusion in 2-D space  Requires special plug-ins or browser

23. How VRML works  VRML code is plain (ASCII) text.  The code describes object(s) attributes, such as, geometry, size, color, textures and location within the virtual world.  In order to view VRML scenes you must have a VRML capable browser. Usually an add-on plug-in or a browser designed for VRML.  When a user encounters VRML on a website the browser receives instructions from the server on the other end.  The server sends VRML code to the user's browser. The VRML viewer then interprets the instructions and displays the scene.  Downloaded VRML text files are interpreted locally, on the users computer, by the VRML player and rendered in real- time by the CPU.  The files range in size from under 100 kb to several megabytes, so bandwidth directly effects download or access time.  Once the world is loaded, the user's experience is dictated by the CPU performance. High performance processors allow faster and smoother navigation through VRML world

24. Animations on the Web  Animation are still created as they always where Series of pictures that are slightly different that are displayed one after another  Different ways of accomplishing this technique on the web Client Pull Server Push Animated Gifs Macromedia Shockwave Macromedia Flash

25. Client Pull  The clients loads the first picture in the series and sets a timer Then load the second Then the third  Uses special “Meta” refresh tag in HTML  Very Slow  example example

26. Server Push  Web Server pushes new pictures in the series to the browser Only works in Netscape Requires special server side programming  Nobody uses it any more

27. Animated Gifs  Probably the easiest way to create an animation Lots of free tools available  http://www.mindworkshop.com/alchemy/alch emy.html http://www.mindworkshop.com/alchemy/alch emy.html  http://www.jasc.com/download_4.asp? http://www.jasc.com/download_4.asp  We will be using Paint Shop Pro in this class  Example http://perleybrook.umfk.maine.edu/sa mples/aGif.htm http://perleybrook.umfk.maine.edu/sa mples/aGif.htm

28. Macromedia  Macromedia Software Shockwave Flash  These are classes all by themselves  Examples http://perleybrook.umfk.maine.edu/samples/u mfkLOGo.html http://perleybrook.umfk.maine.edu/samples/u mfkLOGo.html http://www.cyberdimmensions.com/flash/pres entation.html http://www.cyberdimmensions.com/flash/pres entation.html http://www.cyberdimmensions.com/flash/weis _l9_rocketlaunch6.html http://www.cyberdimmensions.com/flash/weis _l9_rocketlaunch6.html

29. Intranets  Intranets are private Internets limited to a specific organizational needs  Has many of the same applications as the Internet  Segmented away from the Internet by firewalls We’ll discuss firewalls later May allow VPN access through firewalls Picture Source: http://www.iimahd.ernet.in/~jajoo/intranet/intro/images/firewall.gif

30. Intranets applications  Internal e-mail  Databases  Scheduling  Collaboration tools Groupware Chat & IM Whiteboards Videoconferencing Document management

31. VPN’s  Virtual Private Networks  Encrypted traffic that travels in “tunnels” between encryption & decryption devices

32. VPN’s http://static.howstuffworks.com/flash/vpn-site.swf

33. Shopping on the Internet  Shopping on the Internet involves many technologies Databases Encryption Cookies eWallets HTML

34. How Online Shopping works  Demo from Learn The Net Demo from Learn The Net  Steps Find the product you want  Database and search technologies Fill out order form with Personal Info and Credit Card info  Data is encrypted and sent to eMerchant eMerchant verifies Credit Card and info electronically  SET and other protocols eMerchant confirms orders to customer  By e-mail EMerchant contacts distribution center to ship product  UPS, FedEx or USPS

35. How Cookies Work  A cookie is a small text file written by a web server to your hard drive Look for a cookies directory on your PC  The web server that wrote the cookie can read and or modify the cookie (so can sophisticated Hackers)  They are used to track users

36. Cookies  Advantages Allows you to auto-login to site Keeps you from entering your info all the time Helps eMerchant do business  Disadvantage Cookies stay on PC and don’t follow the user Spy-ware! (discuss later) Other people can see your info Cookie from my PC

37. Online shopping carts  Requires login to site Data store in Database at the eMerchant site EMerchant creates a cookie on your PC  As you add stuff to you cart, your cookie gets modified  When you are ready to “check out” you cookie is read and then erased after you have placed the order

38. How Electronic Wallets Work  Online equivalent of a real wallet Store information  Personal  Credit Cards Encrypted  When you need info on online you “open” your wallet and provide the information  Not widely supported

39. Online auctions  One of the mostly successful eCommerce business models Ebay.com Ubid.com  Works like a regular auctions except everything is done Virtually  Online Auction Guide Online Auction Guide