Sony Music and Warner Bros. have filed a federal lawsuit against Anthropic alleging the AI company trained its Claude models on tens of thousands of copyrighted musical compositions without permission, potentially exposing the firm to billions in damages. The suit carries institutional weight because it directly references the same pirated dataset involved in Anthropic’s $1.5 billion settlement just 18 months ago, making a fair-use defense substantially harder and raising questions about whether the company’s compliance practices have truly improved.

• Sony and Warner are seeking up to $150,000 per copyrighted work plus $25,000 per instance of intentional copyright data stripping, potentially totaling several billion dollars in damages.
• The lawsuit names the identical dataset of illegally downloaded materials that Anthropic cofounder Benjamin Mann previously torrented, the same conduct that triggered the $1.5 billion settlement in September 2025.
• Anthropic’s stated defense rests on fair-use doctrine, but the company’s recent billion-dollar settlement severely weakens that argument and signals heightened regulatory and legal risk for institutional investors.

• $150,000 per copyrighted work in damages Sony and Warner seek, plus penalties for copyright stripping.
• $1.5B settlement Anthropic paid 18 months prior over the same pirated dataset now central to this suit.
• Tens of thousands of copyrighted musical compositions allegedly used to train Claude without authorization.

Sony Music Group and Warner Bros. Discovery filed a federal lawsuit against Anthropic on Friday, accusing the AI company of training its Claude language models on tens of thousands of copyrighted musical compositions without permission or compensation.

The plaintiffs are seeking damages of up to $150,000 per work, plus $25,000 for each instance Anthropic allegedly intentionally removed copyright metadata, potentially putting total liability in the billions of dollars.

The suit specifically names copyrighted hits including Bon Jovi’s “Livin’ on a Prayer,” Earth, Wind & Fire’s “September,” and Leonard Cohen’s “Hallelujah” as works incorporated into Anthropic’s training pipeline without authorization.

What makes this lawsuit exceptional is its legal specificity and timing.

Anthropic Faces Second Wave of Damages Over Same Pirated Dataset From 2025 Settlement

The lawsuit directly references the identical dataset of illegally torrented materials that Anthropic cofounder Benjamin Mann downloaded from piracy sites, conduct that resulted in the company’s $1.5 billion settlement in September 2025.

That prior settlement involved thousands of copyrighted books and other written works; the new music industry suit argues the same compromised dataset contained sheet music and song lyrics extracted from those publications.

Sony and Warner’s legal filing states: “Among the many millions of books that Defendants torrented from these illegal pirate websites were books containing the lyrics and sheet music to hundreds or more of Music Publishers’ copyrighted musical compositions.” The timing compounds Anthropic’s legal exposure: the company has had fewer than 18 months to implement compliance controls addressing the exact vulnerability that generated its largest financial penalty.

Anthropic’s response, delivered through a company spokesperson to Reuters, characterizes the suit as recycled allegations already pending before courts. The company stated it will defend itself “robustly” and argued that training AI models on copyrighted material constitutes fair use, a legal doctrine permitting limited access to protected works without permission for transformative purposes.

However, that defense strategy faces a substantial credibility problem: Anthropic has already paid out $1.5 billion to settle substantially similar claims, a settlement that implicitly acknowledged the company could not prevail on fair-use arguments in actual litigation.

The nine-figure payout signals that courts or settlement negotiators rejected the fair-use framing as applied to Anthropic’s practices.

This is the third copyright infringement lawsuit filed by the same legal team representing music publishers, suggesting a coordinated enforcement strategy targeting distinct categories of intellectual property. Earlier suits involved books and news articles; this action extends liability exposure to musical compositions.

The stacking of claims across different media categories, each carrying potential statutory damages in the hundreds of millions, creates cumulative financial and reputational risk that extends beyond any single case.

Fair-Use Defense Weakened by Prior Settlement and Benjamin Mann’s Direct Involvement as Defendant

Anthropic’s planned reliance on fair-use doctrine faces acute legal headwinds given that Benjamin Mann, named directly as a defendant, was personally identified as the individual who conducted the illegal torrenting.

Fair use typically applies to incidental or secondary copying undertaken by parties acting independently; when the same individual responsible for the underlying piracy is also a cofounder of the company using that pirated material to build commercial products, courts are unlikely to credit claims that the use is transformative or falls within fair-use bounds.

The suit describes this as “a brazen campaign of illegally torrenting, scraping, and downloading copyrighted works on a massive scale in order to develop, operate, and reap enormous profits from Anthropic’s Claude series of artificial intelligence models.”

Institutional investors face direct consequences from this legal escalation. Copyright liability has become Anthropic’s largest disclosed financial risk, now generating second and third waves of damages claims across different asset categories, books, news, music, rather than resolving through a single settlement framework.

Each category carries distinct damages calculations and statutory maximums, making total exposure difficult to quantify. The company’s settlement history demonstrates that fair-use arguments have failed when tested, yet Anthropic continues advancing this defense rather than negotiating earlier settlements that might cap damages.

The reputational dimension cuts deeper for institutional stakeholders than the numerical damages alone.

Anthropic has been marketed as a company with strong safety and ethics practices, contrasting itself favorably against competitors with looser operational standards.

The discovery that the company allegedly continued incorporating illegally obtained materials into production systems even after the Mann settlement suggests either: (a) compliance systems implemented post-settlement were ineffective, or (b) the company did not meaningfully change operational practice despite the financial penalty.

Neither interpretation reassures institutional investors concerned with governance quality or legal risk management.

Damages Could Exceed Prior Settlement as Music Suits Expand Across Different Publishing Rights Categories

Sony Music Group and Warner Bros. Discovery control vast catalogs of published compositions, giving them leverage to pursue claims affecting multiple distinct rights holders simultaneously.

The suit seeks $150,000 per work, a calculation that assumes tens of thousands of copyrighted compositions, yielding potential liability well into the billions of dollars, substantially higher than the $1.5 billion paid to settle book-related claims.

Music publishing damages carry higher statutory maximums than written-work infringement, reflecting the distinct legal frameworks governing musical compositions.

The distinction matters for institutional capital allocation: if courts sustain the music publishers’ damages framework, it establishes precedent for substantially higher per-work penalties in future cases, potentially making outstanding copyright liability estimates meaningless.

An investor relying on Anthropic’s public disclosures about legal contingencies could find those estimates rendered obsolete by a single adverse judgment in this case. The company has not disclosed the total number of musical compositions allegedly involved, making it impossible for external stakeholders to calculate maximum exposure accurately.

Settlement negotiations will likely dominate the next phase of this litigation. Sony and Warner have demonstrated willingness to litigate but could face pressure from investors seeking certainty rather than years of discovery and trial risk.

Anthropic, facing a credibility problem with fair-use arguments, may find settlement the only viable path to contain reputational damage and limit discovery into the company’s internal practices regarding copyright compliance.

However, the fact that this suit was filed despite, or perhaps because of, the prior settlement suggests the publishers view Anthropic’s original penalty as inadequate compensation and may demand a substantially larger second settlement to prevent further litigation.

Anthropic has stated it will defend the case “robustly,” but the company’s legal strategy remains unstated: will it continue the fair-use argument that failed in the prior settlement, or will it enter settlement negotiations acknowledging the weakness of that position? The answer will arrive through discovery filings or negotiated resolutions expected within the next six to nine months, with both outcomes carrying material implications for institutional investors’ assessment of the company’s financial stability and management quality.