In the more than 125 years since he first appeared, Sherlock Holmes has popped up everywhere from fan fiction set in outer space to screen adaptations like CBS’s “Elementary,” set in contemporary Manhattan. But now, following a legal ruling, the deerstalker-wearing detective is headed to another destination: the public domain.

A federal judge has issued a declarative judgment stating that Holmes, Watson, 221B Baker Street, the dastardly Professor Moriarty and other elements included in the 50 Holmes works that Arthur Conan Doyle published before Jan. 1, 1923, are no longer covered by United States copyright law, and can therefore be freely used by others without paying any licensing fee to the writer’s estate.

The ruling came in response to a civil complaint filed in February by Leslie S. Klinger, the editor of the three-volume, nearly 3,000-page “New Annotated Sherlock Holmes” and a number of other Holmes-related books. The complaint stemmed from “In the Company of Sherlock Holmes,” a collection of new Holmes stories written by different authors and edited by Mr. Klinger and Laurie R. King, herself the author of a mystery series featuring Mary Russell, Holmes’s wife. Read more.