According to the Wikipedia article on the movie, Disney owns it:
https://en.wikipedia.org/wiki/Who_Framed_Roger_Rabbit
"Walt Disney Productions purchased the film rights to the story in 1981. Jeffrey Price and Peter S. Seaman wrote two drafts of the script before Disney brought in executive producer Steven Spielberg and Amblin Entertainment to help finance the film."
"Disney released the film through its Touchstone Pictures division on June 22, 1988 to financial success and positive reviews. Who Framed Roger Rabbit spurred a renewed interest in the Golden Age of American animation and spearheaded the modern era of American animation, especially the Disney Renaissance."