Who Owns an AI-Assisted Story? Copyright in 2026

In the United States, the parts of a story that a human wrote, chose or arranged can be protected by copyright. The parts a machine generated on its own cannot. That line has not moved this year; if anything, it has set harder.

Three things put it there: a federal appeals court ruling from March 2025 that the Supreme Court declined to review in March 2026, a January 2025 report from the US Copyright Office, and a registration decision about an AI-illustrated comic that has become the standard example. None of them says that using AI ruins your claim to a book. All of them say the claim covers your contribution, not the tool’s.

Computer scientist Stephen Thaler applied to register an image called “A Recent Entrance to Paradise” and listed his AI system, the Creativity Machine, as its sole author. The Copyright Office refused. On March 18, 2025, the US Court of Appeals for the D.C. Circuit affirmed, holding that the Copyright Act of 1976 requires a work to be authored in the first instance by a human being.

Thaler asked the Supreme Court to take the case. On March 2, 2026, the Court denied the petition, which leaves the D.C. Circuit ruling in place.

The part of the opinion that matters most to writers is easy to miss. The court said the human-authorship requirement “does not prohibit copyrighting work that was made by or with the assistance of artificial intelligence.” It only requires that the author be a human, the person who used the tool, not the tool itself. Thaler’s case failed because he named the machine as the author, not because AI was involved.

On January 29, 2025, the Copyright Office published Part 2 of its report on copyright and artificial intelligence, focused on whether AI outputs can be protected. Its conclusions line up with the court.

AI-generated output is protected only where a human author has determined sufficient expressive elements. Human-authored material that is perceptible in the output can qualify, and so can a human’s creative arrangement or modification of the output. Using AI to assist, or including AI material inside a larger human work, does not bar copyright.

The sentence that trips people up: protection does not extend to “the mere provision of prompts.” Typing “write a slow-burn enemies-to-lovers chapter set in a lighthouse” and keeping what comes back does not, on its own, make you the author of that text in the Office’s view, however much effort went into the prompt.

In September 2022, Kristina Kashtanova registered a comic book called Zarya of the Dawn without mentioning that its images came from Midjourney. After the Office learned of it, it reviewed the registration and, in a February 21, 2023 letter, concluded that she was the author of the text and of the selection, coordination and arrangement of the text and images, but not of the Midjourney-generated images themselves.

The original certificate was cancelled and replaced with a narrower one covering only what she created. For a fiction writer, the lesson translates neatly: your words and your structure are yours; raw machine output inside the book is not, even if the book as a whole carries your name.

Registration guidance the Office issued in March 2023 still governs the paperwork. Applicants have a duty to disclose AI-generated material that is more than trivial, name only humans as authors, describe the human contribution, and exclude the AI material from the claim. If a registration already went through without that disclosure, the guidance says to correct it with a supplementary registration; leaving it uncorrected risks losing the registration’s benefits.

This is separate from what stores ask. Amazon’s publishing platform has its own AI questions, covered in what KDP’s AI disclosure means for fiction writers.

Ownership of your story is a different question from whether the model behind your tool was trained lawfully, but authors have pressed both. In Bartz v. Anthropic, Judge William Alsup ruled in June 2025 that training on books was fair use, while copying millions of pirated books into a central library was not, according to Reuters. The case then settled for $1.5 billion, roughly $3,000 per work, and Judge Araceli Martínez-Olguín granted final approval on July 20, 2026, according to the Authors Guild. The settlement covers past conduct only and does not release claims about AI outputs.

For writers using AI tools, nothing in that settlement changes who owns what you write. It does show that the source of a model’s training data now carries real legal and financial weight.

Think in layers. Your plot choices, characters, scene order and the prose you write or substantially rework are the strongest part of your claim. Text you selected and arranged, cutting ten drafts down to the one paragraph that works and placing it where it belongs, can count as authorship too. Passages you pasted in unchanged from a model are the weakest part.

So write the parts that matter yourself and treat the AI as an editor rather than a ghostwriter. Our guide to writing slow-burn romance with an AI editor works this way: you draft, the tool suggests, you decide.

Keep your drafts and revision history. If anyone ever questions what you contributed, dated versions showing your own writing and edits are the clearest evidence you have.

Read your tool’s terms. They decide what the provider claims over your inputs and outputs, and whether your drafts can be used for training. Copyright law decides what is protectable at all; a contract cannot make machine output copyrightable, but it can limit what you are allowed to do.

ShortFling’s writing studio includes an AI editor that is free within a daily quota. It is built for the editor model above: you write chapter by chapter and use the AI to help revise.

Before publishing, every author signs a creator agreement confirming the work is their own original work, that they hold the rights needed to publish it, and that all characters are adults and purely fictional. Our Terms of Service say content you submit remains yours, and that you grant ShortFling a licence to host, process and display it as needed to run the service. Pressing Publish submits a story for review; it goes public only once approved, and you can keep editing while it waits.

Finished stories sit in the fiction library, which has SFW and NSFW sections; the NSFW section requires confirming you are 18+, and availability varies by region and platform. ShortFling is a fiction platform, not an AI chat or companion app. This post is an overview, not legal advice; for a specific book or contract, talk to a lawyer.