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Use the "Look up a Legal Case" tab to search for a particular case or search for a topic. It is often easier to identify relevant cases through news searches or IS organizations (see the Current Debates tab) and then search for those specifically, rather than trying to search for relevant cases by topic in Lexis.
Results may include entries for the same case in different stages of appeals. For example, a search for Authors Guild vs. HathiTrust, a recently resolved case involving copyright and fair use in the creation of the HathiTrust digital archive, brings up district and appeals court hearings.
When looking at an individual court case and decision, choose "Shepardize" in the "Next Steps" drop-down on the top right in order to related cases, including cases cited in the decision, and also academic legal research articles about the case. These may be important for you to look at as well to fully understand the law about the topic.