To make life easier, just don't use anything of theirs from after 1928.<p>However, anything released in 1928 and earlier is fair game. That includes gloves (movie poster, Willie title card etc. from 1928 has gloves), colours, etc.<p>Link to only known remaining 1928 poster in colour: <a href="https://movieposters.ha.com/itm/movie-posters/animation/mickey-mouse-stock-poster-celebrity-productions-1928-one-sheet-27-x-41-/a/7067-83117.s" rel="nofollow">https://movieposters.ha.com/itm/movie-posters/animation/mick...</a><p>So really, the only limit is that you can't use the different eye shape, etc., or his signature exclamation "hot dog!" which came later.