Sister of deceased Superman creator Joe Shuster, Jean Peavy, filed the suit as a "termination notice" on Warner Bros.' right to use the character, but a 1992 agreement between the studio and Peavy negated this ruling. If terminated, Warner Bros. would have lost the right to use Superman, and Man of Steel would have been delayed indefinitely.
Here is the Judge's ruling.
"The 1992 Agreement, which represented the Shuster heirs' opportunity to renegotiate the prior grants of Joe Shuster's copyrights, superseded and replaced all prior grants of the Superman copyrights. The 1992 Agreement thus represents the parties' operative agreement and, as a post-1978 grant, it is not subject to termination."
Warner Bros. offered no comment on the ruling.
Man of Steel was released June 14th, 2013 and stars Henry Cavill, Amy Adams, Michael Shannon, Diane Lane, Russell Crowe, Antje Traue, Harry Lennix, Richard Schiff. The film is directed by Zack Snyder.