The Muppets the Muppets film and television library. Exceptions included the "Sesame Street" characters, which were previously sold to Sesame Workshop; the "Fraggle Rock" characters, which were retained by Henson; and the distribution rights to "The Muppets Take Manhattan", "Muppets from Space", and "Kermit's Swamp Years," which were retained by Sony Pictures Entertainment. Following the acquisition, Disney formed The Muppets Holding Company (later known as The Muppets Studio), a wholly owned subsidiary responsible for managing the characters and franchise. As a result, the term "Muppet" became a legal trademark of Disney; under license from Disney, Sesame Workshop continues to use the term
The Muppets character; the performer who controls the mouth usually provides the voice for the character. As technology has evolved, the Jim Henson team and other puppeteers have developed several means to operate the Muppets for film and television; these include the use of suspended rigs, internal motors, remote manipulators, and computer enhanced and superimposed images. Creative use of different technologies has allowed for scenes in which the Muppets appear to perform such complex movements as riding bicycles, rowing boats, and dancing wholly independently of the performer. According to writer Michael Davis, the characters tend to develop "organically", alluding to the performers