Thanks to a co-investment deal that Warner Bros and Paramount’s parent companies had entered into, the birth of Comedy Central came to be. In turn, this meant that both companies had rights to certain properties, such as the South Park franchise, and they would share profits and responsibilities. One such example was the distribution of South Park: Bigger, Longer, and Uncut, which was Paramount’s film domestically, but Warner Bros. internationally.
Article source: https://www.cinemablend.com/news/2475525/that-time-interstellar-south-park-and-more-huge-franchises-were-traded-for-one-another