Sony Music Publishing, Warner Chappell and other music publishers have sued Anthropic and two of its co-founders, alleging that the AI company illegally acquired copyrighted works used to train Claude.
The complaint names Dario Amodei and Benjamin Mann alongside the company. It was filed late Friday in the US District Court for the Northern District of California and accuses the defendants of conducting what the publishers call a broad campaign of torrenting, scraping and downloading protected material.
These are allegations in a newly filed lawsuit, not judicial findings. Anthropic told TechCrunch that it disagrees with the claims and intends to defend itself robustly in court.
The complaint targets how training material was acquired
The publishers accuse Anthropic of using thousands of copyrighted works to train Claude. TechCrunch reports that the suit describes the conduct as theft and says the company used illegal torrenting to obtain millions of books, including volumes containing lyrics and sheet music.
That emphasis separates two questions that can otherwise become blurred in disputes over generative AI: whether copyrighted material may be used in model development and whether the particular copies were obtained lawfully.
The source article does not provide Anthropic’s detailed response to each allegation. Its statement rejects the publishers’ position in general terms. The complaint must therefore be evaluated through the court process, where both sides can present evidence and legal arguments.
Sony Music Publishing and Warner Chappell are joined by numerous other publishers. Music Business Worldwide first reported the filing, according to TechCrunch. The article does not list every plaintiff, identify the individual works at issue or state what damages and remedies the publishers requested.
The lawsuit nevertheless broadens the conflict over AI training data into music publishing. Lyrics and sheet music may appear inside books, allowing the publishers to argue that a collection allegedly assembled for model development also contains material within their catalogues.
Earlier Anthropic cases shape the new dispute
Anthropic has already faced intellectual-property claims over the material used to develop products such as Claude. TechCrunch says some of the lawyers involved in the latest filing also represent Concord Music Group and Universal Music Group in a case filed in January.
The same legal team led Bartz v. Anthropic, where authors alleged that the company trained its products on copyrighted works. Anthropic was ordered to pay $1.5 billion in that case after a judge ruled that using copyrighted works was lawful while acquiring the content through piracy was not.
The new complaint draws on that distinction but is not identical to the earlier disputes. TechCrunch describes it as particularly broad and says it builds on the other cases. The music publishers specifically allege illegal torrenting and point to books containing lyrics and sheet music.
The earlier ruling does not by itself prove the facts alleged in this filing. It does, however, explain why the method of acquisition is central. A court could examine the legality of obtaining the source files separately from the later act of using their contents in training.
Personal claims raise the stakes for Anthropic’s leaders
Naming co-founders Amodei and Mann makes the case more than a claim against the corporate entity alone. TechCrunch’s brief report does not explain the specific conduct attributed to either individual, so the basis and scope of those personal allegations remain unclear from the available article.
Anthropic’s defense may address both the factual account of how material entered its datasets and the legal responsibility assigned to the company and its leaders. At this stage, the source confirms only that the suit has been filed and that Anthropic disputes it.
The case adds another group of rights holders to the legal pressure surrounding AI training. It also shows how disputes increasingly turn on provenance: not merely what a model learned from, but where the files came from and how they were collected.
For publishers, the complaint frames the issue as unauthorized acquisition of creative catalogues. For Anthropic, the immediate position is a categorical rejection of the claims. The court will have to decide whether the publishers can substantiate their account and whether the alleged conduct creates liability for the company, Amodei and Mann.
Until that happens, the central facts remain contested. What is clear is that the boundary drawn in earlier litigation between using works and obtaining pirated copies is now being tested in a new music-industry case.
