theodp writes "Amazon has sued Cendant for allegedly infringing four patents covering electronic commerce at its Orbitz, Avis and other Web sites. Cendant, the biggest U.S. provider of travel and real-estate services, knew 'or should have known' it infringed when using the tools to secure credit-card transactions, handle customer referrals and manage data, according to the lawsuit filed June 22 in federal court in Seattle. Amazon itself was sued by Cendant last year for patent infringement over its recommendation technology. So much for five years of Amazon patent reform."
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