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
All of Baum's subsequent Oz books, published between 1907 and 1920, had their copyright extended by subsequent laws. Between 1962 and 1974, Congress passed nine copyright acts extending the copyright one or two years each time (these acts also introduced the rule that rounds the copyright term up to the end of that calendar year). This ensured that all works published after September 1906 (and renewed as necessary) stayed copyrighted until the Copyright Act of 1976 took effect. The 1976 Act extended the renewal to 47 years, meaning works could stay copyrighted for 75 years after publication. Thus, the rest of Baum's Oz books did not enter public domain until the 75-year terms was up. "Ozma of Oz" (published in 1907) was the first to enter the public domain in 1983, and the subsequent books followed, with "Glinda of Oz" (published in 1920) finally entering the public domain in 1996.