J.D. Carreker & Associates Inc., maintaining it owns exclusive rights to certain electronic check presentment technologies, has begun notifying rival companies that it intends to defend a patent it has held since 1993.

Industry insiders say the move sets the stage for legal battles over a promising new business. But J.D. "Denny" Carreker, president of the Dallas- based company that bears his name, said he isn't looking for a fight.

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