A mouse in every house? Mickey enters public domain in 2024.

M-I-C-K-E-Y will soon belong to you and me.

With several asterisks, qualification, and caveats, Mickey Mouse in his earliest form will be the leader of the band of characters, films, and books that will become public domain as the year turns to 2024.

In a moment many close observers thought might never come, at least one version of the quintessential piece of intellectual property and perhaps the most iconic character in American pop culture will be free from Disney’s copyright as his first screen release, the 1928 short “Steamboat Willie,” featuring both Mickey and Minnie Mouse, becomes available for public use.

“This is it. This is Mickey Mouse. This is exciting because it’s kind of symbolic,” said Jennifer Jenkins, a professor of law and director of Duke’s Center for the Study of Public Domain, who writes an annual Jan. 1 column for “Public Domain Day.” ”I kind of feel like the pipe on the steamboat, like expelling smoke. It’s so exciting.”

United States law allows a copyright to be held for 95 years after Congress expanded it several times during Mickey’s life.

“It’s sometimes derisively referred to as the Mickey Mouse Protection Act,” Ms. Jenkins said. “That’s oversimplified because it wasn’t just Disney that was pushing for term extension. It was a whole group of copyright holders whose works were set to go into the public domain soon, who benefited greatly from the 20 years of extra protection.”

“Ever since Mickey Mouse’s first appearance in the 1928 short film Steamboat Willie, people have associated the character with Disney’s stories, experiences, and authentic products,” a Disney spokesperson said in a statement to The Associated Press. “That will not change when the copyright in the Steamboat Willie film expires.”

Current artists and creators will be able to make use of Mickey, but with major limits. It is only the more mischievous, rat-like, non-speaking boat captain in “Steamboat Willie” that has become public.

“More modern versions of Mickey will remain unaffected by the expiration of the Steamboat Willie copyright, and Mickey will continue to play a leading role as a global ambassador for the Walt Disney Company in our storytelling, theme park attractions, and merchandise,” Disney’s statement said.

Not every feature or personality trait a character displays is necessarily copyrightable, however, and courts could be busy in the coming years determining what’s inside and outside Disney’s ownership.

“We will, of course, continue to protect our rights in the more modern versions of Mickey Mouse and other works that remain subject to copyright,” the company said.

Disney still solidly and separately holds a trademark on Mickey as a corporate mascot and brand identifier, and the law forbids using the character deceptively to fool consumers into thinking a product is from the original creator. Anyone starting a film company or a theme park will not be free to make mouse ears their logo.

Disney’s statement said it “will work to safeguard against consumer confusion caused by unauthorized uses of Mickey and our other iconic characters.”

“Steamboat Willie,” directed by Walt Disney and his partner Ub Iwerks and among the first cartoons to have sound synced with its visuals, was actually the third cartoon featuring Mickey and Minnie the men made, but the first to be released. It features a more menacing Mickey captaining a boat and making musical instruments out of other animals.

In it, and in a clip from it used in the introduction to Disney animated films in recent years, Mickey whistles the 1910 tune “Steamboat Bill.” The song inspired the title of the Buster Keaton film “ Steamboat Bill Jr,” released just a few months before “Steamboat Willie,” which in turn may have inspired the title of the Disney short. The copyright wasn’t renewed on the Keaton film and it’s been in the public domain since 1956.

Another famous animal sidekick, Tigger, will join his friend Winnie the Pooh in the public domain as the book in which the bouncing tiger first appeared, “The House at Pooh Corner,” turns 96. Pooh, probably the most celebrated prior character to become public property, took on that status two years ago when A.A. Milne’s original “Winnie the Pooh” entered the public domain, resulting in some truly novel uses, including this year’s horror film “Winnie The Pooh: Blood and Honey.”

Young Mickey could get the same treatment.

“Now, the audience is going to set the terms,” said Cory Doctorow, an author and activist who advocates for broader public ownership of works.

Jan. 1, 2024, has long been circled on the calendars of public domain watchers, but some say it serves to show how overlong it takes for U.S. works to go public, and many properties with less pedigree than Winnie or Minnie can disappear or be forgotten with their copyrights murky.

“The fact that there are works that are still recognizable and enduring after 95 years is is frankly remarkable,” Mr. Doctorow said. “And it makes you think about the stuff that we must have lost, that would still have currency.”

Other properties entering the U.S. public domain are Charlie Chaplin’s film “Circus,” Virginia Woolf’s novel “Orlando,” and Bertolt Brecht’s musical play “The Threepenny Opera.”

The current copyright term passed in 1998 brought the U.S. into closer sync with the European Union, making it unlikely Congress would extend it now. There are also now powerful companies, including Amazon with its fan-fiction-heavy publishing arm and Google with its books project, that in some cases advocate for the public domain.

“There’s actually more pushback now than there was 20 some years ago when the Mickey Mouse act was passed,” said Paul Heald, a professor at the University of Illinois College of Law who specializes in copyright and international intellectual property law.

In some instances, the U.S. goes well beyond Europe, and maintains copyright on work that is already public in its country of origin, though international agreements would allow the U.S. to adopt the shorter term of other nations on work produced there.

The books of George Orwell for example, including “Animal Farm” and “1984,” both published in the 1940s, are now public domain in his native Great Britain.

“Those works aren’t going to fall into the public domain in the United States for 25 years,” Mr. Heald said. “It would be literally costless for Congress to pass a law saying, ‘we now adopt the rule of the shorter term,’ which would throw a butt ton of works into the public domain over here.”

This story was reported by The Associated Press.