The case, filed in a New York federal court on July 30, includes claims Zillow is using watermarked images owned by CoStar Group — parent company of competing home search site Homes.com — on its sites and on Redfin and Realtor.com through its rental listings syndication deals.

Zillow was sued on Wednesday by Homes.com owner CoStar Group, which accused the largest U.S. online real estate portal of publishing at least 46,979 copyrighted photos without permission. The complaint filed in Manhattan federal court seeks unspecified compensatory and punitive damages,

CoStar CEO Andy Florance threatened to sue Redfin and Realtor.com if they do not “immediately remove our images.”