Research in Motion, no stranger to patent litigation, finds itself with a new lawsuit on its hands after Motorola filed papers in a Texas federal court over the past weekend alleging that RIM's BlackBerry smartphone violates seven of Motorola's U.S. patents on mobile-communications technology. But RIM countersued Motorola in another federal court in Texas, claiming the company engaged in "anti-competitive conduct" in demanding "unreasonable" royalties for several patents that RIM licenses from Motorola.

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