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AII-1000-45537
AllegedThe record is a lawsuit, complaint or accusation that has not been decided.

Carlsen Verlag sues OpenAI for copyright infringement of "Das NEINhorn"

Carlsen Verlag, author Marc-Uwe Kling, and illustrator Astrid Henn sued OpenAI, alleging ChatGPT reproduces their copyrighted children's book "Das NEINhorn" so closely that the originals were likely unlawfully used to train the AI system. The lawsuit claims ChatGPT generates nearly identical stories and illustrations, and even produces complete print templates mimicking the publisher's materials.

10 October 2026 · OpenAI · Intellectual property and appropriation
10 October 2026
AII-1000-455378 sources ↓
Quick facts
Category
Intellectual property and appropriation
Country
Germany
Source
Spiegel Online
Date
10 October 2026
Drafted by
Raidu Incident Detection

What happened

Carlsen Verlag filed a lawsuit against OpenAI's Irish subsidiary, alleging that ChatGPT reproduces copyrighted content from the children's book series "Das NEINhorn" by Marc-Uwe Kling and Astrid Henn, first published in 2019.

According to Carlsen, simple prompts in ChatGPT generate stories that closely match the original work's creative elements, with illustrations barely distinguishable from originals. ChatGPT also reportedly generates complete print templates including cover design, impressum, false order numbers, and publisher logos.

Reported impact

Carlsen alleges the originalworks' detailed reproduction indicates they were unlawfully used to train OpenAI's language and image models through memorization.

Index analysis

Author Marc-Uwe Kling stated that individuals face penalties for downloading a single film, book, or audiobook illegally, yet questioned why OpenAI can copy all art and culture worldwide without consequence.

Classification

Category
Intellectual property and appropriation
Industry
Media, social platforms and marketing
Country
Germany
Harm status
Actual harm
Intent
Unknown
Timing
Post-deployment
Harmed
Business
Failure modes
Training data misuse
Consequences
Litigation
AI systems
ChatGPT

Sources and evidence

This record was researched and written by the Index, based on the following original reporting.

Spiegel Online
"Neinhorn": Verlag kämpft wegen Kinderbuch gegen ChatGPT
19 August 2026
RP Online
KI und Urheberrecht: "NEINhorn" sagt Nein zu ChatGPT - Carlsen-Verlag klagt gegen OpenAI
19 August 2026
Börsenblatt
Carlsen klagt gegen Open AI
19 August 2026
Norddeutscher Rundfunk
Carlsen Verlag verklagt OpenAI: ChatGPT verletzt offenbar Urheberrechte bezogen auf "Das NEINhorn"
19 August 2026
ZDFheute
Rechte verletzt? "NEINhorn"-Verlag Carlsen klagt gegen OpenAI
19 August 2026
taz.de
Marc-Uwe Kling und Carlsen Verlag verklagen OpenAI wegen Urheberrechtsverletzung
20 August 2026
Bayerischer Rundfunk
Das NEINhorn geklaut? Carlsen-Verlag verklagt Open AI
20 August 2026
Frankfurter Allgemeine
Carlsen-Verlag und Marc-Uwe-Kling verklagen Open AI wegen "NEINhorn"-Klau
20 August 2026
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