Mickey Mouse and Ub Iwerks. Iwerks again served as the head animator, assisted by Johnny Cannon, Les Clark, Wilfred Jackson and Dick Lundy. This short was intended as a parody of Buster Keaton's "Steamboat Bill, Jr.", first released on May 12 of the same year. Although it was the third Mickey cartoon produced, it was the first to find a distributor, and thus is considered by The Disney Company as Mickey's debut. "Willie" featured changes to Mickey's appearance (in particular, simplifying his eyes to large dots) that established his look for later cartoons and in numerous Walt Disney films. The cartoon was
Mickey Mouse works such as the early Mickey Mouse cartoons will remain under copyright until at least 2023. However, some copyright scholars argue that Disney's copyright on the earliest version of the character may be invalid due to ambiguity in the copyright notice for "Steamboat Willie". The Walt Disney Company has become well known for protecting its trademark on the Mickey Mouse character—whose likeness is closely associated with the company—with particular zeal. In 1989, Disney threatened legal action against three daycare centers in Florida for having Mickey Mouse and other Disney characters painted on their walls. The characters were removed, and rival