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Users can sell copyrighted works that they own You can sell your books, DVDs, audio CDs, and other materials as long as you are not retaining a copy for yourself, or (of course) selling copies of the work without permission from the copyright holder Some people arguing in favor of file trading with copyrighted materials claim that the DMCA infringes on their ability to share content they own In fact, under existing copyright law they do not own the copyrighted material and certainly do not possess the rights to redistribute the content unless they are reselling it in an allowed manner Copyrights will expire at some time in the future and fall into the public domain.

usually synchronized with video and audio logs to help evaluators analyze users' behavior and understand how users worked on the tasks they set Specialist software tools are used to collect and analyze the data The log is also time-stamped so it can be used to calculate how long a user spends on a particular task or lingered in a certain part of a website or software application Explicit counters that record visits to a website were once a familiar sight Recording the number of visitors to a site can be used to justify maintenance and upgrades to it For example, if you want to find out whether adding a bulletin board to an e-commerce website increases the number of visits, being able to compare traffic before and after the addition of the bulletin board is useful.

You can also track how long people stayed at the site, which areas they visited, where they came from, and where they went next by tracking their Internet Service Provider (ISP) address For example, in a study of an interactive art museum by researchers at the University of Southern California, server logs were analyzed by tracking visitors in this way (McLaughIin et al, 1999) Records of when people came to the site, what they requested, how long they looked at each page, what browser they were using, and what country they were from, etc, were collected over a seven-month period The data was analyzed using Webtrends, a commercial analysis tool, and the evaluators discovered that the site was busiest on weekday evenings.

In another study that investigated lurking behavior in listserver discussion groups, the number of messages posted was compared with list membership over a three-month period to see how lurking behavior differed among groups (Nonnecke and Preece, 2000) An advantage of logging user activity is that it is unobtrusive, but this also raises ethical concerns that need careful consideration (see the dilemma about observing without being seen) Another advantage is that large volumes of data can be logged automatically However, powerful tools are needed to explore and analyze this data quantitatively and qualitatively An increasing number of visualization tools are being developed for this purpose; one example is WebLog, which dynamically shows visits to websites, as illustrated in Figure 123 (Hochheiser and Shneiderman, 2000)..