The Internet Archive was created in 1996 as the institutional memory of the online world, storing snapshots of ever-changing Web sites and collecting other multimedia artifacts. Now the nonprofit archive is on the defensive in a legal case that represents a strange turn in the debate over copyrights in the digital age.

Beyond its utility for Internet historians, the Web page database, searchable with a form called the Wayback Machine, is also routinely used by intellectual property lawyers to help learn, for example, when and how a trademark might have been historically used or violated.

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