not 100% but as I understand it, the princesses and other such characters typically come under 2 categories: Characters like Anna and Elsa, who Disney holds copyrights for, and characters like Snow White and Tinkerbell, who are public domain because of how long they've been a thing (and often Disney didn't own the stories to begin with). In the latter group, Disney does own copyrights on their versions, which is why the appearances have been changed somewhat in this version