Adaptations of The Wizard of Oz
"The Wonderful Wizard of Oz" is a 1900 children's novel written by American author L. Frank Baum. Since its first publication in 1900, it has been adapted many times: for film, television, theatre, books, comics, games, and other media.Many of the television programs cited in this list are not strict adaptions of "The Wizard of Oz"; rather, they have reinterpreted aspects of the book, such as characters and plot, to create sequels, prequels or side-plots, which are inspired by Baum's original text.
There are over 40 canonical Oz books, including 14 by Baum, all of which are considered "official" sequels or prequels to "The Wonderful Wizard of Oz". In addition, the following books use the Oz milieu as settings for their tales:Kevin Scott Collier. "The Wonderful Animated World of the Wizard of Oz: The Good, The Bad and The Ugly!" CreateSpace Independent Publishing Platform, 2018.
Copyright status of The Wizard of Oz and related works in the United States
The first two books written by Ruth Plumly Thompson, "The Royal Book of Oz" (published in 1921) and "Kabumpo in Oz" (published 1922), entered the public domain 75 years later (1997 and 1998, respectively) pursuant to the Copyright Act of 1976.
The next twelve books ("The Cowardly Lion of Oz" through "Speedy in Oz", published between 1923 and 1934) were still copyrighted when the 1998 Sonny Bono Act extended the copyright term a further twenty years, meaning works would now be copyrighted for 95 years. These twelve books of Thompson's are therefore still copyrighted, and will not begin entering the public domain until 2019. By 2030, all of them will be in the public domain.