CoStar Group Inc., a leader in commercial real estate information, has filed a lawsuit against Zillow in a New York federal court, alleging widespread copyright infringement. The lawsuit accuses Zillow of unlawfully using over 46,000 of CoStar's copyrighted photographs on its website and partner sites like Redfin and Realtor.com. CoStar claims the infringement could result in potential damages exceeding a billion dollars. The company asserts that Zillow is exploiting its intellectual property by displaying these images, many with CoStar's watermark, more than 250,000 times on Zillow alone, and is further amplifying the infringement through partnerships with Redfin and Realtor.com. CoStar's CEO criticized Zillow's actions as deliberate and systemic, emphasizing the company's commitment to protecting its investments and holding wrongdoers accountable. This case marks one of the largest image infringement cases in history, highlighting ongoing tensions in the real estate information industry.