Adaptations and Derived Works
The enduring popularity of Sherlock Holmes has led to hundreds of works based on the character – both adaptations into other media and original stories. The copyright in all of Conan Doyle's works expired in the United Kingdom in 1980 and are public domain there. All works published in the United States prior to 1923 are in the public domain; this includes all Sherlock Holmes stories with the exception of some of the stories contained within The Case-Book of Sherlock Holmes. For works published after 1923 but before 1963, if the copyright was registered, its term lasts for 95 years. The Conan Doyle heirs registered the copyright to The Case Book (published in the USA after 1923) in 1981 through the Copyright Act of 1976.
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