A Hearst Corp. subsidiary’s challenge to a Boston federal judge’s refusal to slap an injunction on Aereo Inc. continues a copyright war between broadcasters and the Internet television distributor.

Hearst filed its opening appellate brief on Monday in the U.S. Court of Appeals for the First Circuit in Hearst Stations Inc. v. Aereo Inc. Hearst is appealing Judge Nathaniel Gorton’s October 2013 denial of its preliminary injunction request.