Download Digital Video Disks - E-Commerce - Lecture Slides and more Slides Fundamentals of E-Commerce in PDF only on Docsity! Digital Video Disks (DVDs) • Developed by movie studios and consumer electronics companies in 1995. • Compatible with CDs. Same size and thickness as CDs. Up to 25 times the storage capacity as CDs. • TPS for DVDs includes – CSS encryption (“content scrambling system”) – R/W’able copy-control marks (e.g., “copy freely,” “one copy,” “no copies”) – Macrovision analog copy protection – Other ingredients Docsity.com Studios’ Overall IP-Management Strategy • Use TPS to “keep honest people honest.” • Assume (temporarily) that lack of bandwidth will prevent large-scale Internet distribution of movies. • Use courts aggressively to punish (alleged) violators of existing copyright laws and lobby heavily for new laws that favor rights holders. Docsity.com Techies’ Objection to DMCA • What is an “effective technological protection measure”? If a skilled hacker can break it, is it “effective”? If an average computer-literate person can break it, but few do, is it “effective”? • Weakens incentives for content owners to pay for good IP-management technology. • Shifts costs from content owners to society at large, by shifting responsibility from TPSs to courts and police. • Exceptions for R&D are vague. Docsity.com Coming Attraction for February 20 Ernest Miller of the Yale Law School will discuss at least one of the suits now working their ways through the courts in which the MPAA is suing people for DMCA violations. One “technological protection measure” that was circumvented was the CSS encryption scheme in the DVD system. Constitutionality of the DMCA “circumvention- tool distribution” ban is being challenged. Docsity.com Gnutella P2P File Sharing • “Pure Peer-to-Peer.” • Peers are called “servents.” • Servents communicate over standard HTTP. • Goal is “total decentralization.” In particular, no Napster-like server that “directs traffic,” collects data, and otherwise centralizes control. Docsity.com Gnutella Advantages and Disadvantages Main Advantage : “Search for S” can be done in many ways, e.g., structured database search, simple text matching, “fuzzy” text matching, etc. “Result” can take many forms. Main Disadvantage : Inefficiency! – “Flood” of Requests. If average number of neighbors is C and average TTL is D, each search can cause CD request messages. – Natural evolution into many barely-connected subnets, not one “user community.” Other Disadvantage : Request monitoring. (Comes with standard HTTP.) Docsity.com . . . Docsity.com Gnutella History • Gnutella was written by Justin Frankel, the 21- year-old founder of Nullsoft. • Nullsoft posted Gnutella on the Web, March 1999. • Nullsoft acquired by AOL, June 1999. • A day later AOL yanked Gnutella, at the bequest of Time Warner. • People had already downloaded and shared the program. • Gnutella continues today, run by independent programmers. Docsity.com
