Background
Sony Music and more than fifty other record labels and music publishers went to federal court in Virginia against Cox Communications, one of the largest cable internet providers in the United States. Rather than suing the individual subscribers who had used peer-to-peer networks to download copyrighted songs, the labels sued Cox itself — arguing that Cox was secondarily liable because it kept providing internet service to subscribers the labels had repeatedly flagged as repeat infringers.
A jury found Cox liable on two theories: contributory infringement (helping another party infringe) and vicarious infringement (profiting from infringement the provider could have stopped). The verdict came in at roughly one billion dollars. The Fourth Circuit tossed the vicarious-liability portion of the award but upheld the contributory-infringement finding, reasoning that Cox’s knowledge of specific repeat-infringer subscribers, combined with its continued provision of service, was enough.
The Supreme Court granted certiorari on the contributory-liability question and heard argument on December 1, 2025.
The Court’s Holding
In a unanimous judgment, the Court reversed the Fourth Circuit and sent the case back for further proceedings. Justice Thomas, writing for seven Justices, laid out a narrower test for contributory copyright infringement: the defendant must have intended its service to be used to infringe. That intent can be shown in only two ways — by proof that the defendant actively induced infringement (for example, by advertising the service as a tool for piracy), or by proof that the defendant sold a service that is tailored to infringement, meaning it is not capable of substantial non-infringing uses.
Simply knowing that some subscribers were using the service to infringe is not enough, the Court held. Cox offered a general-purpose internet connection with enormous legitimate uses and actively discouraged piracy by sending warning notices, suspending accounts, and ultimately terminating repeat offenders. Under the newly clarified standard, that kind of provider cannot be lumped in with the operators of services designed for infringement.
The Court left vicarious-liability doctrine alone — the labels did not challenge the Fourth Circuit’s dismissal of that theory, so it simply does not appear in the opinion. Justice Sotomayor, joined by Justice Jackson, concurred only in the judgment. She agreed that Cox should not be liable on this record but warned that the majority’s two-paths-only framework sweeps too broadly and discards decades of flexible secondary-liability analysis running back through Sony Corp. of America v. Universal City Studios (the 1984 Betamax case) and MGM Studios v. Grokster.
Key Takeaways
- Knowledge alone isn’t liability. An ISP that receives DMCA-style notices and knows particular subscribers are repeat infringers is no longer on the hook for contributory infringement just because it keeps their service running.
- Inducement or tailored-for-infringement are the only two doors. Plaintiffs must now plead and prove either active encouragement of specific infringing acts, or that the defendant’s service lacks substantial lawful uses. That’s a much higher bar than “material contribution plus knowledge.”
- Acceptable-use enforcement is now a shield, not a flag. Warnings, suspensions, terminations, and terms of service that prohibit infringement are evidence against intent, not evidence of red-flag awareness.
- Vicarious liability still exists. The ruling does not touch the separate doctrine that imposes liability on defendants who have the right and ability to supervise infringement and derive a direct financial benefit from it. Expect plaintiffs to lean harder on that theory.
- The billion-dollar judgment is wiped out. On remand, the Fourth Circuit will have to apply the new standard — and under it, Cox’s conduct almost certainly falls outside contributory liability.
Why It Matters
This is the most consequential secondary-liability decision in a generation. For the last decade, the music industry’s enforcement strategy has rested on pushing ISPs and platforms to police their users through repeat-infringer policies backed by the threat of massive contributory-infringement judgments. Cox v. Sony pulls the legal foundation out from under that strategy. Going forward, general-purpose service providers — cable ISPs, mobile carriers, cloud hosts, CDNs, and most SaaS companies — have a strong argument that routine awareness of user misconduct, without more, cannot produce contributory liability.
For the content industries, the decision is a signal that the future of copyright enforcement has to move closer to the actual infringers, or to services whose business models are visibly tied to infringement. For technology companies and their investors, it reduces a significant long-tail legal risk and reopens the design space for products that interact with copyrighted works. And for subscribers, it quietly but meaningfully lowers the odds that their home internet will be cut off because of unproven piracy accusations routed through their ISP.