Aug. 11 (Bloomberg) -- Six American Indians want the U.S. Patent and Trademark Office to cancel the trademarks for the Washington Redskins football team, saying the name is disparaging to indigenous groups. The petition, filed today with the Trademark Trial and Appeal Board in Alexandria, Virginia, cites ``extensive evidence concerning the history of the use of the term `Redskin' and public perception of the objectionable term,'' the group said in a statement. Cancellation of the trademarks wouldn't force the team to change its name. It would allow anyone to sell products bearing the Redskins name and logo without paying royalties. ``The term `Redskins' is an extraordinarily insensitive and derogatory term and one that should not be granted exclusive trademark licenses by the federal government,'' said Suzan Shown Harjo, president of the advocacy group The Morning Star Institute.