The Washington Redskins have elbowed into a case before the U.S. Court of Appeals for the Federal Circuit brought by the front man of a rock band challenging part of a federal law that bans disparaging trademarks.

The National Football League team filed an amicus brief on Thursday to overturn a 1981 precedent that allows the U.S. Patent and Trademark Office to reject derogatory trademarks under the Lanham Act.