#OnThisDay in 1900 'The Wonderful Wizard of Oz' was published. Its plot has inspired countless films & theatre plays over the years.
The novel is in the public domain, but what about derivative works?
Learn about derivative use of public domain contents https://euipo.europa.eu/tunnel-web/secure/webdav/guest/document_library/observatory/documents/publications/public_domain/Derivative_Use_of_Public_Domain_Content_English_v1.pdf
