 In most cases, such material is either restricted from use after the license expires or the characters redesigned or renamed to avoid copyright infringement.Within the fictional history of the Marvel Universe, the tradition of using costumed secret identities to fight or commit evil had long existed, but it came into prominence during the days of the American "Wild West" with heroes such as Carter Slade/the Phantom Rider.During the 20th century, the tradition was reinvigorated by Steve Rogers/Captain America and the Invaders in the 1940s, who fought for the Allies of World War II.