The Mouse in the Maze of Copyright and Trademark Law
The earliest Mickey Mouse lost its copyright in 2024, but a still-living trademark keeps the character fenced in.
When the first reels of Steamboat Willie and the silent Plane Crazy fell into the United States public domain on January 1, 2024, the headlines treated it as the end of a long siege: after roughly ninety-five years, the earliest Mickey Mouse was finally free for anyone to copy, animate, parody, or sell. The reality is more tangled. Copyright term may have run out on a 1928 cartoon, but the same cartoon character is also a registered trademark of one of the most litigious brand owners in the world. The result is a single black-and-white rodent standing at the intersection of two bodies of federal law that point in opposite directions, and a set of questions that courts have spent decades only partly answering.
Why the copyright finally expired
The copyright story is, by now, almost a parable about how protection terms grow. Works published in 1928 were once destined to fall into the public domain far earlier, but Congress repeatedly lengthened the term, most consequentially through the Sonny Bono Copyright Term Extension Act of 1998, which added twenty years and pushed expiration for many older works to ninety-five years from publication. That arithmetic is what produced a January 1, 2024 release date for everything first published in 1928, the silent Steamboat Willie among them.
What entered the public domain is narrow and specific: the version of Mickey fixed in those 1928 films. That is a pie-eyed, gloveless, rubber-hosed character with a long snout and no dialogue, not the rounded, white-gloved, red-shorted Mickey of later decades. Each subsequent design refinement carried its own copyright, and those later expressive choices remain protected on their own staggered schedules. A creator who copies the 1928 figure is on firm ground; one who borrows the gloves, the modern proportions, or the familiar voice is borrowing from works that have not yet expired.
Where trademark law enters the maze
Copyright and trademark protect different things. Copyright rewards original expression and is meant to expire, returning works to the commons. Trademark protects the link between a symbol and a commercial source, exists to prevent consumer confusion, and can last indefinitely so long as the mark stays in use. Disney holds federal trademark registrations covering Mickey Mouse imagery as a brand identifier, and those registrations do not lapse merely because one early film aged out of copyright. The company said as much in the run-up to 2024, signaling that it would continue to guard against uses that confuse the public about whether a product comes from or is endorsed by Disney.
That is a defensible position as far as it goes. A maker who slaps the Steamboat Willie figure on a toy box in a way that signals Disney sponsorship is no longer making a copyright problem for itself; it may be making a trademark one. The hard question is how far an owner can stretch a still-living trademark to police a character whose copyright the public is now entitled to use.
The “mutant copyright” problem and Dastar
That stretch has a name in the literature: the “mutant copyright,” a trademark claim deployed to recapture control over material that copyright has deliberately released. The Supreme Court confronted the move directly in Dastar Corp. v. Twentieth Century Fox Film Corp., 539 U.S. 23 (2003). After Fox let the copyright on a television series based on Eisenhower’s Crusade in Europe lapse, a competitor repackaged the public-domain footage and sold it without credit. Fox sued under the Lanham Act for “reverse passing off,” arguing the failure to attribute the source was a false designation of origin.
A unanimous Court rejected the claim. Reading “origin” in Section 43(a) to mean the producer of the tangible goods rather than the author of the underlying creative content, the Court held that the Lanham Act could not be used to require attribution for material the public was free to copy. To hold otherwise, Justice Scalia wrote, would create a “species of mutant copyright law” that limited the public’s federal right to copy and to use expired works. Dastar is the strongest authority for the proposition that trademark cannot quietly resurrect an expired copyright.
What trademark can still reach
Dastar did not abolish trademark protection for characters; it cabined a particular abuse of it. Trademark still operates where its own logic applies. The governing provisions are the Lanham Act’s false-designation and dilution sections, 15 U.S.C. § 1125(a) and § 1125(c). Section 1125(a) reaches uses likely to confuse consumers about source, sponsorship, or affiliation. Section 1125(c) goes further for “famous” marks, allowing the owner to act against blurring or tarnishment even without proof of confusion.
So the line, in theory, runs along function. Copying the 1928 Mickey as expression is what the public domain permits. Using a Mickey image as a brand signal, as a badge that tells buyers where a product comes from, is what trademark still polices. A short film that retells the Steamboat Willie story, or a horror riff that reimagines the character, sits closer to the protected-expression side. A line of merchandise whose packaging implies Disney made it, or whose presentation drags the wholesome mark into a tarnishing context, drifts toward the trademark side.
The recurring fault line is whether a defendant is using the character to say something or to signal a source. The first is the province of the now-public-domain copyright; the second is where a living trademark can still bite. Drawn well, that distinction keeps trademark from swallowing the commons; drawn loosely, it becomes the mutant copyright the Court warned against.
An older quarrel the courts never fully settled
The tension predates the mouse. In Frederick Warne & Co. v. Book Sales, Inc., 481 F. Supp. 1191 (S.D.N.Y. 1979), the publisher conceded that several Peter Rabbit books had passed into the public domain yet claimed trademark rights in cover illustrations said to identify the source of its editions. The court allowed that a public-domain design could acquire independent trademark significance if it functioned as a source identifier rather than as mere decoration. Decades later, Dastar pulled in the opposite direction, treating trademark claims layered over expired copyrights with deep suspicion. The two cases are not flatly irreconcilable, but they leave the doctrine unsettled at exactly the point where the Mickey question lives.
Related doctrines circle the same problem from other angles. Right-of-publicity disputes such as Comedy III Productions, Inc. v. Gary Saderup, Inc., 25 Cal. 4th 387 (2001), ask when a depiction is transformative enough to escape an exclusive merchandising right, a test that resonates with how a court might separate an expressive reuse of a public-domain character from a confusing commercial one. None of these lines of authority hands a creator a clean rule for Mickey; together they sketch a zone of risk rather than a bright line.
What to watch next
For now, the practical guidance is modest and durable. Creators may use the 1928 character as expression, should avoid later copyrighted refinements still under protection, and should steer clear of any presentation that suggests Disney is the source or sponsor of their work. Whether an aggressive trademark or dilution theory could narrow that freedom in a future case is precisely what remains open. The likeliest test will arrive when a commercially significant Steamboat Willie product provokes a suit, and a court is forced to decide whether Dastar‘s warning against mutant copyrights or the older intuition of Frederick Warne controls. Until then, the mouse remains free in copyright and fenced in trademark, and the maze between the two is where the next decade of disputes will be fought. Readers tracking how courts police the boundaries of federal authority over expression may find the same source-versus-substance instinct at work in commentary on geofence warrants and the Fourth Amendment; ongoing developments are followed in this publication’s commentary and case tracker.
This publication offers commentary and analysis, not legal advice.
Questions readers ask
Is Mickey Mouse now in the public domain?
Only the specific 1928 version is. The black-and-white character fixed in Steamboat Willie and the silent Plane Crazy entered the United States public domain on January 1, 2024. Later, separately copyrighted designs of Mickey remain protected.
Why did the copyright last until 2024?
Works first published in 1928 received ninety-five years of protection after Congress extended terms, most notably through the Sonny Bono Copyright Term Extension Act of 1998. Ninety-five years from 1928 expires at the end of 2023, releasing the works on January 1, 2024.
If the copyright expired, why does Disney still have rights?
Copyright and trademark are separate. Copyright on the early film expired, but Disney’s trademark rights in Mickey as a brand identifier do not lapse on the same schedule and can continue indefinitely so long as the mark stays in use.
What is a “mutant copyright”?
It is shorthand for using trademark law to recapture control over material that copyright has deliberately released into the public domain. The Supreme Court criticized this maneuver in Dastar Corp. v. Twentieth Century Fox Film Corp.
What did Dastar actually hold?
The Court ruled that the Lanham Act’s bar on false designation of origin does not require attribution for material whose copyright has expired, because “origin” refers to the maker of the physical goods, not the author of the underlying content.
Can a creator make a Steamboat Willie film or game?
Generally yes, using the 1928 character as expression, provided the work does not copy still-protected later designs and does not present itself in a way that implies Disney made or endorsed it.
What would cross the trademark line?
Uses likely to confuse consumers about source or sponsorship under 15 U.S.C. § 1125(a), or uses that blur or tarnish a famous mark under § 1125(c), can still draw a trademark claim even though the copyright has expired.
Does the modern white-gloved Mickey become free too?
Not in 2024. Each later design carries its own copyright term. The red shorts, white gloves, and rounded modern proportions remain protected and will expire on their own later schedules.
Why is the law described as unsettled?
Older authority such as Frederick Warne & Co. v. Book Sales, Inc. allowed public-domain designs to gain trademark significance, while Dastar later treated trademark claims over expired copyrights with suspicion. Courts have not fully reconciled the two.
What is the safest course for a creator?
Use only the 1928 character, avoid later protected refinements, and avoid any branding or packaging that suggests Disney is the source or sponsor of the work.
