CPSC 155b Spring 2003 E Commerce Doing Business on the Internet Homework 2 Page 1 of 3 Homework 2 This assignment must be submitted electronically using the Yale Classes server by 5pm EST Tuesday February 18 2003 It covers readings and lectures through Thursday February 13 2003 Late homeworks will not be accepted Please be sure to type your name and e mail address at the top of your homework assignment In addition please include your NetID and hw2 in the name of your file e g vr48 hw2 doc Details about this appear in the instructions below Instructions for submitting your homework are given below Homework questions follow USING THE CLASSES SERVER Note on security warnings When viewing the home page or syllabus for CS155 using the Classes server your browser will automatically jump to the webpage for the course on the Zoo http zoo cs yale edu classes cs155 Because this page resides on a different server your browser may warn you that the page you are trying to view has both secure and nonsecure items You should respond Yes to displaying nonsecure items Trust us the CS155 page does not contain malicious code But we don t use the Classes server to host the entire website so be prepared to see this warning Log into the Classes server 1 Access http classes yale edu using your web browser 2 Click on Student Login at the top of the second column 3 Enter your NetID and Password in the appropriate text boxes and click Login For first time users ONLY 1 If this is the first time you have used the Classes server you will now see a welcome page with your name Check that the photo and e mail options are correct and scroll down to the courseselection area of the page 2 Select courses you would like to add to your course list To add CS155 select Computer Science from the Subject drop down list and type 155b in the Course Number text box 3 Click Finished at the bottom of the page when your are finished 4 You will now see a page with several frames the top and bottom frames allow you to navigate through the Classes server system and the middle frame displays content This is the first page you will see when you log into the Classes server in the future For other users add CS155 to your course list 1 Once you have successfully logged in you will see a web page with several frames In the top frame under the Web Page Syllabus etc buttons you will find a drop down list Click to view the contents of the list 2 If Computer Science 155b appears in the list you have added the course to your course list Continue with directions on uploading your assignments below 3 If not in the bottom frame to the right of the Logout link click the Your Course List link 4 Scroll down the page to the Add another course section Under Subject choose Computer Science and type 155b in the text box to the right 5 Click Update 6 The top frame should reload so that the drop down list contains Computer Science 155b Logging out of the Classes server Whenever you are finished using the Classes server you should logout and close your browser window To do this click the red Logout link in the bottom frame You will receive confirmation then close your browser window CPSC 155b Spring 2003 E Commerce Doing Business on the Internet Homework 2 Page 2 of 3 To upload your assignment 1 Type your assignment and save it in one of the following formats Microsoft Word doc Text txt Rich Text rtf PostScript ps or Adobe Portable Document Format pdf The filename must contain no spaces Please include your NetID and hw2 as part of the filename and add the appropriate file extension if your are using a non Windows machine e g vr48 hw2 doc for a Word document If you have specific questions about a format or how to convert to one of these please e mail the TA at vijayr cs yale edu 2 Log into the Classes server as described above 3 Select Computer Science 155b from the drop down list of courses 4 Click the blue Upload link in the top frame 5 Enter the full path to your assignment in the text box or click Browse and select the file you saved in the box that pops up 6 Click the Upload button at the bottom of the page 7 You should receive confirmation that your file was uploaded Changing your assignment 1 If you wish to re submit your homework before the deadline you must change the filename of your assignment e g change vr48 hw2 doc to vr48 hw2 2 doc 2 Follow the procedure above to upload the new file The file will be marked with the date and time of submission We will use the most recent file HOMEWORK QUESTIONS 1 10 points Do you think that the first sale rule of copyright law is an appropriate mechanism in the digital realm Briefly explain why or why not 2 5 points In her February 6 2003 lecture on Internet radio Ms Kunz observed that since the passage of legislation aimed at digital content distribution e g DMCA and HR5469 large scale for profit terrestrial broadcasters are doing more webcasting than they were before To which business phenomenon covered earlier this semester is this analogous 3 10 points Technically and legally why is Kazaa harder to shut down than Napster Five points will be given for a correct answer about the technical aspect and five for a correct answer to the legal aspect 4 15 points Here is one basic Technical Protection System for a content distributor i ii Encrypt the content Broadcast the content using a low cost communication channel e g web page or broadcast television iii Distribute the decryption key to paying customers e g to work with specific hardware or software that plays the content Distribute the key on a higher cost lower bandwidth channel iv Users that pay for the decryption key can decrypt the broadcast and view the original content Users that do not have the decryption key will be unable to decrypt the broadcast content A diagram is provided on the following page CPSC 155b Spring 2003 E Commerce Doing Business on the Internet k Homework 2 Page 3 of 3 k For five points each briefly explain three technical difficulties that can arise if a content distributor uses this approach 5 15 points A 5 points HTTP the protocol used to exchange web page requests and web page content defines a sequence of steps that a client e g a web browser and a server e g a web server must execute to complete a web page request The protocol assumes that a reliable connection from the client to the server can be established Which principles and or protocols discussed in class make this assumption valid B 10 points In part A we noted that