Copyright status of The Wizard of Oz and related works in the United States
"The Wonderful Wizard of Oz" was published in 1900, and was the first to enter the public domain in "1956". This allowed Reilly & Lee, the publisher of all the other Oz books (as well as Baum's other books) to issue their own edition of "The Wizard of Oz", which had previously been published by George M. Hill Company and later by the Bobbs Merill Company after Hill went bankrupt..
Dorothy and the Wizard of Oz
Dorothy and the Wizard of Oz is an American animated children's television series based on L. Frank Baum's novel "The Wonderful Wizard of Oz" and its subsequent books, as well as its 1939 film adaptation. The series debuted on Boomerang SVOD on June 29, 2017. The series was picked up for the second and third seasons.