Ultraman, Kamen Rider, and Super Squad were Japanese feature television series and movie series. Their copyrights were still in the hands of Japanese copyright agents. To be specific, Ultraman's copyright was owned by Ultraman Company, while Kamen Rider and Super Squad's copyrights were owned by Gokosha (the company of five children) and Toei (Toei Entertainment) respectively. These copyright agents would refer to the works of Japanese manga, novels, games, and other media when they authorized the production of feature TV series and movies, and abide by the relevant Japanese animation copyright laws and regulations.