THE FILING
● Filed: late Friday 28 August, U.S. District Court for the Northern District of California. 48 pages.
● Plaintiffs: Sony Music Publishing and Warner Chappell Music.
● Defendants: Anthropic, plus Dario Amodei and Benjamin Mann as individuals.
● Sought: up to $150,000 per infringed song, plus $25,000 per removed copyright management information.
The allegation
The complaint alleges Anthropic conducted what it calls a brazen campaign of illegally torrenting, scraping and downloading copyrighted works to train Claude. Specifically, that it obtained lyrics and sheet music through pirate sources including Library Genesis and the Pirate Library Mirror, and scraped licensed lyric sites including Musixmatch and LyricFind in violation of their terms.
Works named include compositions recorded by The Beatles, Taylor Swift, Michael Jackson, Mariah Carey, Marvin Gaye, Survivor and Bon Jovi. The publishers say the material was used both as training input and reproduced in model output.
Anthropic's response
An Anthropic spokesperson said the company will defend itself robustly, and characterised the filing as the third lawsuit from the same lawyers, recycling allegations from cases already before the courts.
That is a fair point about the plaintiffs' counsel — the same firm has litigated against Anthropic before, and the same publishers are already active against Suno and Udio. This suit targets the model vendor rather than the app.
Why this one is not routine
THE DISTINCTION A COURT ALREADY DREW
In the earlier authors' case, a federal judge found that using copyrighted material to train a model can be lawful in certain circumstances — but that acquiring that material through piracy is not. Anthropic was ordered to pay $1.5 billion.
This complaint is built precisely on the second half. It is less an argument about whether training is fair use than an argument about how the training data was obtained.
That framing is why the recycled-allegations response, while accurate about the lawyers, does not fully answer the filing. The acquisition question has already been decided once, against Anthropic, at scale.
Scope, compared with what came before
| Case |
Scope |
| BMG v Anthropic |
493 compositions |
| Sony and Warner |
Tens of thousands of compositions |
| Authors' case, decided |
$1.5 billion judgment on acquisition method |
At the statutory ceiling of $150,000 per work, tens of thousands of compositions produce a theoretical figure in the billions. Statutory maximums are rarely awarded in full, and the number in a complaint is a starting position rather than a forecast. But the order of magnitude is the point of filing it that way.
Naming the founders individually
Amodei and Mann are named as individual defendants rather than only the company. That is a deliberate escalation — it raises personal exposure and makes settlement calculus different from a corporate-only action.
It also lands in a month where Anthropic has been in court on a separate front. A federal judge struck down the Pentagon's supply-chain risk designation of the company last week as unlawful retaliation, with a second case still pending in Washington.
What it means if you build on Claude
| If you are... |
The practical read |
| Using Claude commercially |
Nothing changes today. Litigation of this kind runs for years |
| Generating anything lyric-adjacent |
Models declining to reproduce lyrics is a policy position, and this is why |
| Training or fine-tuning on scraped data |
The precedent is about acquisition, not use. Where your corpus came from is the exposure |
| Watching the AI IPO timelines |
Anthropic has been reported as targeting an October listing. Litigation is a disclosure item |
Sources
FAQ
Who is suing Anthropic?
Sony Music Publishing and Warner Chappell Music, the publishing arms of Sony Music and Warner Music, in a 48-page complaint filed late on 28 August 2026 in the U.S. District Court for the Northern District of California.
What are they alleging?
That Anthropic obtained song lyrics and sheet music through pirate sources including Library Genesis and the Pirate Library Mirror, and scraped licensed lyric sites, then used the material to train Claude and reproduced it in output.
How much are they seeking?
Up to $150,000 per infringed song — the statutory ceiling for wilful infringement — plus $25,000 for each instance of removed copyright management information, across tens of thousands of compositions.
What is Anthropic saying?
That it will defend itself robustly, and that this is the third lawsuit from the same lawyers recycling allegations from cases already before the courts.
Why does the $1.5 billion judgment matter here?
In an earlier authors' case a federal judge held that training on copyrighted material can be lawful in some circumstances but acquiring it through piracy is not. This complaint is built on the acquisition question rather than the training question.
Does this affect me if I use Claude?
Not today. Litigation of this scale runs for years, and nothing about model availability has changed.
How does it differ from the Suno and Udio cases?
Same publishers, upstream target. Those actions concerned music-generation apps; this one names the model vendor whose weights power downstream products.