A company that holds several patents on location-based Internet search techniques has sued listings portal Trulia, claiming the company infringed on two of them.

A spokesman for Trulia said the company would have no comment on the lawsuit, filed on July 28 by Alexandria, Va.-based CIVIX-DDI LLC in U.S. District Court for the Eastern District of Virginia.

Since it was founded in 1998, CIVIX has sued a number of companies that operate websites it claims infringe on its patents, including two of the nation’s largest multiple listing services. Both MLSs settled with CIVIX out of court.

The National Association of Realtors in May announced it had reached an agreement with CIVIX that would provide blanket protection from lawsuits for all MLSs and Realtor associations if NAR can raise $7.5 million in licensing fees by Aug. 16.

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