We manage the literary, merchandising, and advertising rights in Sir Arthur Conan Doyle’s works and all characters, including Sherlock Holmes, Dr. Watson, and Professor Challenger. The Conan Doyle Estate Ltd owns the last remaining protected story and character copyrights in the USA and also own trademark and common law rights in the name and image of Sir Arthur Conan Doyle, Sherlock Holmes, Professor Challenger and other Conan Doyle characters in the USA, European Union, U.K. and many other countries around the world.