Copyright

Elementary, After All: Klinger v. Conan Doyle Estate and the Public-Domain Character

Judge Posner held that Sherlock Holmes and Dr. Watson, as drawn in the pre-1923 stories, are free for anyone to use, rejecting the estate's 'complex character' copyright theory.

September 8, 2025
A deerstalker hat and magnifying glass on an old book, evoking Sherlock Holmes
A character whose foundational stories have entered the public domain is free to use, even if later installments remain under copyright. Shutterstock
Educational content, not legal advice. This article explains general legal concepts. It does not create an attorney–client relationship. For your specific situation, consult a licensed attorney.

Every screenwriter, novelist, and showrunner who wants to revive a classic character eventually asks the same question: is it free to use? Few decisions answer that question with the clarity—and the bite—of Klinger v. Conan Doyle Estate, Ltd., No. 14-1128 (7th Cir. June 16, 2014). Writing for a unanimous panel, Judge Richard Posner held that Sherlock Holmes and Dr. John Watson, as established in the fifty Arthur Conan Doyle works already in the public domain, belong to everyone, and that the estate could not extend its grip over those characters by pointing to a handful of still-copyrighted later stories. The opinion is a foundational text for chain of title and public-domain analysis in film, television, and publishing, and a pointed warning to estates that monetize expired rights.

At a glance

  • Case: Leslie S. Klinger v. Conan Doyle Estate, Ltd., No. 14-1128 (7th Cir. June 16, 2014), affirming the U.S. District Court for the Northern District of Illinois.
  • Court: United States Court of Appeals for the Seventh Circuit (Posner, J.).
  • Facts: Klinger, a Sherlock Holmes scholar, co-edited anthologies of new Holmes stories. The estate demanded a license fee, asserting continuing rights in the characters. Klinger sought a declaratory judgment that he could freely use elements drawn from the public-domain works.
  • Holding: Story elements—including the characters of Holmes and Watson—introduced in the public-domain stories are free to use. Copyright persists only in the original increments of expression added by the ten stories still under copyright.
  • Subsequent history: In a later opinion, Posner awarded Klinger attorney fees, sharply criticizing the estate’s licensing demands.

Conan Doyle wrote sixty Holmes works—four novels and fifty-six short stories—between 1887 and 1927. By the time of the litigation, fifty of those works had entered the United States public domain; ten stories, published in the United States after the then-applicable copyright cutoff, remained protected. The estate’s business model rested on licensing the use of Holmes and Watson to authors, studios, and producers. Klinger’s suit threatened that model by asking a court to confirm what much of the public assumed: that the canonical detective was, by 2014, largely free.

The “complex character” theory—and its rejection

The estate’s central argument was inventive. It contended that Holmes and Watson are “complex” or “round” characters whose full personalities were not completed until the final stories. Because some of those completing stories remained under copyright, the estate reasoned, the characters as a whole stayed protected until the last story entered the public domain. On this theory, an author drawing on Holmes risked infringing the residual copyright in the still-protected installments even when using only traits established decades earlier.

Posner rejected the theory as having “no basis in statute or case law.” Copyright protects original expression as it is fixed; when an author adds new material to a pre-existing character in a later work, copyright attaches only to that new increment, not retroactively to the earlier, already-public elements. He analogized to derivative works: a new film based on a public-domain novel earns copyright only in its original additions, leaving the underlying public-domain material free. Extending protection to the whole character because later works refined it would, Posner warned, effectively grant perpetual copyright by installment—precisely what the Constitution’s “limited Times” and the public-domain regime forbid.

The practical upshot is a clean rule. A user may freely deploy the Holmes and Watson of the pre-1923 stories—the deductive genius, the loyal physician-narrator, 221B Baker Street, Mrs. Hudson, the violin, the cocaine habit, and the rest of the early canon. What a user may not copy, without a license, are the specific original elements first introduced in the ten still-copyrighted stories.

Increment-by-increment: the chain-of-title lesson

Klinger teaches that public-domain status is assessed element by element, work by work—not character by character as an indivisible whole. For producers and studios, this requires a granular chain-of-title analysis. The question is never simply “is Sherlock Holmes in the public domain?” but rather “which attributes of Holmes derive from public-domain works, and which were first introduced in works still under copyright?”

That distinction has real teeth. After Klinger, later disputes turned on whether particular character traits—an emotional warmth in Holmes, for instance, or a specific backstory—first appeared in the protected late stories. A film that draws only on the early canon stands on firm ground; one that imports a trait unique to a still-copyrighted story invites a claim. The decision thus pushes rights clearance toward careful, source-by-source mapping rather than blanket assumptions about a famous character’s availability.

The fee award and the warning to estates

The story did not end with the merits. After prevailing, Klinger sought attorney fees, and Posner granted them in a follow-on opinion that became as famous as the merits decision. He characterized the estate’s pattern—demanding license fees under threat that distributors like Amazon and Barnes & Noble would refuse to carry unlicensed Holmes works—as a “disreputable business practice” bordering on a form of extortion. The message to estates and rightsholders was unmistakable: asserting copyright over public-domain material, and leveraging market intermediaries to extract licenses for it, can carry consequences beyond losing the case.

Open questions

  • How much delineation must a trait have? Klinger protects original increments in the late stories, but how distinctive a later-added trait must be before its use infringes is left to case-by-case judgment.
  • Where is the line between a public-domain trait and its later refinement? Characters evolve gradually; deciding which work first “introduced” a given attribute can be genuinely difficult.
  • How does the rule interact with newer works that retell the canon? Modern adaptations may blend public-domain and licensed elements, complicating the clearance analysis the decision demands.

Implications

  • Public domain is assessed element by element. Rights clearance must map character attributes to specific source works, not treat a famous character as wholly free or wholly owned.
  • No perpetual copyright by installment. Adding new material to an old character extends protection only to the new increment, never to the earlier public-domain elements.
  • Estates face limits—and risk. Demanding licenses for public-domain material can fail on the merits and expose the rightsholder to fee awards and reputational cost.
  • Creators gain certainty. Writers and studios can confidently build on the early canon of long-running characters, sharpening the value of works whose foundational installments have aged into the public domain.
  • Adaptation strategy follows the canon line. Productions can reduce risk by drawing traits and elements from confirmed public-domain works and licensing only what is genuinely still protected.

Frequently asked questions

Is Sherlock Holmes in the public domain now? As of Klinger, the characters as drawn in the fifty public-domain works were free to use. The few stories that remained under copyright in 2014 have since entered the public domain in the United States, but the case’s element-by-element method remains the controlling analysis for any character in this posture.

Can an author copyright a character all over again by adding new traits later? No. New original material in a later work earns copyright only in that new material. It does not revive or extend protection over the earlier, already-public elements of the character.

Why does this matter for film and television? Producers reviving classic characters must trace each trait they use to its source work. Klinger makes clear that “famous” does not mean “owned,” and that careful chain-of-title mapping—not assumptions—governs what is free.

Authorities and sources