The film is in the public domain and the original versions of Mickey and Minnie are public domain. But that does NOT apply to the later versions of Mickey that you'd find Disney pushing today (e.g., at parks, on apparel, etc.). Further, Disney has been trying to continue to assert copyright even over the original version of the character. See here for more info: https://www.cullenllp.com/blog/steamboat-willie-in-the-publi...
