On March 6, 2025, the U.S. District Court for the Southern District of New York confirmed that historical events are not subject to copyright protection.
This is true even if the events were discovered through original research. In Ackerman v. Pink, 2025 U.S. Dist. LEXIS 40028 (S.D.N.Y. Mar. 6, 2025), the court explained that although copyright protection applies to an artistic expression of historical events, the events themselves are not subject to copyright protection.
This case began in August 2023, when Plaintiff Daniel Ackerman brought claims for copyright infringement, unfair competition, and tortious interference against individuals and companies that contributed to the production of the 2023 film Tetris. Ackerman alleged that the film contained “glaring similarities” to his own book, The Tetris Effect: The Game That Hypnotized The World, which was copyrighted and published in September 2016. Ackerman further asserted that the creators of the film used his book to create the film without his consent. To substantiate his claims, Ackerman provided the court with an “exhaustive analysis and examination of the film and the book” that outlined “the substantial similarities between the two works.”
In response, Defendants—which include The Tetris Company (the company that manages the Tetris brand), the screenwriter of the film, and various producers of the film—filed a motion to dismiss Ackerman’s lawsuit in March 2024, asserting that “(i) [Ackerman’s] copyright infringement claim failed as a matter of law; (ii) his unfair competition claim was preempted by the Copyright Act and failed to state a claim; and (iii) his tortious interference claim was barred by the statute of limitations and failed to state a claim.”
The court addressed each argument in turn. First, the court outlined the two elements of a copyright infringement claim: (1) that a defendant “actually copied” the plaintiff’s work; and (2) that “the copying is illegal because a substantial similarity exists between the defendant’s work and the protectible elements of plaintiff’s.” Peter F. Gaito Architecture, LLC v. Simone Dev. Corp., 602 F.3d 57, 63 (2d Cir. 2010) (quoting Hamil Am. Inc. v. GFI, 193 F.3d 92, 99 (2d Cir. 1999)).
The court then emphasized that “[w]orks of history and historical fiction present unique complexities for substantial similarity analysis.” Effie Film, LLC v. Pomerance, 909 F. Supp. 2d 273, 290-91 (S.D.N.Y. 2012). To this end, the court explained that “copyright protection applies to expression but does not extend to ideas or facts, because ‘[t]he primary objective of copyright is not to reward the labor of authors, but “[t]o promote the Progress of Science and Useful Arts.”’” Feist Publ’ns, Inc. v. Rural Tel. Serv. Co., Inc., 499 U.S. 340, 349-50 (1991) (emphasis added) (quoting U.S. CONST. art. I, § 8, cl. 8). Thus, the court held that historical events cannot be copyrighted as a matter of law and thus do not factor into the “substantial similarity” analysis.
Applying this well-established logic here, the court conducted a thorough analysis of the similarities between the book and the film but did not consider similarities based on the specific historical events that were referenced in both works. Rather, the court looked at the artistic expression of the historical events, but not as it relates to the use of the historical events themselves.
The court concluded that there was no substantial similarity between the expression of the historical events portrayed in the film and the book, and thus dismissed Ackerman’s copyright infringement claim. In reaching this decision, the court pointed to specific differences in the expression of “true events” between the two works, such as the way relationships were portrayed, the order in which the events were presented, and the extent to which facts were dramatized or exaggerated. The court noted that although the two works “tell the stories of the same real people” and cover “the same time period,” the defendants “were entitled to use the facts contained” in the book “so long as they did not copy [Ackerman’s] unique expression of those facts.”
Next, the court dismissed Ackerman’s unfair competition claim, explaining that this claim was preempted by the Copyright Act because it was based on the same allegations as the copyright claim, and the subject matter of the works “falls within the type of works protected by the Copyright Act.”
Finally, the court dismissed Ackerman’s tortious interference claim on the grounds that it was time-barred by the applicable statute of limitations.
This decision highlights an important limit on copyright protection for artistic works that are based on historical events—while artistic expressions of such events may receive some copyright protection, the historical events themselves do not, even if those true events are discovered through original research.