6. UPDATE: As some of you suspected, “Anne of Green Gables” is in the public domain.
Quill and Quire explains:
Montgomery’s books entered the public domain in 1992, 50 years after her death in 1942. However, the Anne of Green Gables Licensing Authority, owned by the province of Prince Edward Island and Montgomery’s heirs, Ruth Macdonald and David Macdonald, still protects the “words and images depicting the fictional characters, places and events described in Montgomery’s novel Anne of Green Gables and related novels.”