163,148 Piracy Notices, a $1 Billion Verdict, Zero Liability: Supreme Court Clears Cox Communications in Sony Music Fight (2026)

163,148 piracy notices. 6 million subscribers. A $1 billion jury verdict. On March 25, 2026, the Supreme Court of the United States looked at all three numbers and ruled that none of them made Cox Communications liable for a single dollar of Sony's copyright infringement. Cox Communications, Inc. v. Sony Music Entertainment, No. 24-171, is now the most important copyright ruling for internet service providers in a generation, and it turns on a distinction most people miss: knowing about piracy is not the same as being responsible for it.

How a $1 Billion Verdict Was Built

Cox Communications serves roughly 6 million internet subscribers, each tied to an IP address. Sony Music Entertainment and other major music labels hired a company called MarkMonitor to hunt down piracy across the internet. Over a 2-year period, MarkMonitor sent Cox 163,148 notices flagging IP addresses associated with illegal music downloads. Cox responded with a graduated warning system: a notice after the second flag, suspension after more, and account termination after 13 notices. That system ended 98 percent of identified infringement, by Cox's own account, but it terminated only 32 subscribers for piracy while cutting off hundreds of thousands for unpaid bills.

Sony sued Cox directly, rather than the individual users doing the pirating, on two theories: that Cox contributed to the infringement by continuing to serve subscribers it knew were pirating, and that Cox profited from it. A federal jury sided with Sony on both theories, found Cox's infringement willful, and awarded $1 billion in statutory damages. The Fourth Circuit upheld the contributory liability finding, reasoning that supplying internet service while knowing the recipient will use it to infringe copyrights was itself culpable conduct.

The Two-Question Test the Fourth Circuit Ignored

The Copyright Act does not say anywhere that a party can be held liable for someone else's infringement. Over decades, the Supreme Court built that liability itself, and confined it tightly to two situations, drawn from the Court's 1984 Betamax ruling and its 2005 Grokster decision. A provider is contributorily liable only if it induced the infringement through specific acts of encouragement, or if it sold a service that is not capable of any substantial, commercially significant use except infringement.

Neither fit Cox. Cox never advertised its internet service as a piracy tool the way the file-sharing companies did in Grokster. And internet access is about as far from a tool "tailored to infringement" as a product can get; it is used for banking, schoolwork, video calls, and streaming as much as it is for anything illegal. The Fourth Circuit's rule, that mere knowledge plus inaction was enough, went further than any prior Supreme Court precedent had ever allowed.

Why the DMCA Argument Backfired on Sony

Sony's fallback argument was clever: if ISPs cannot be held liable for serving known infringers in the first place, then the Digital Millennium Copyright Act's safe harbor, which shields ISPs that terminate repeat infringers, would be pointless. Why build a shield against liability that never existed? The Court rejected this too. The DMCA does not create liability for ISPs; it only creates defences against a liability that has to come from somewhere else first. A safe harbor with nothing to hide from is not evidence that the underlying hiding place must exist.

Unanimous in Result, Divided in Reasoning: Sotomayor's Concurrence

Every Justice agreed Cox should win, but not for the same reason. Justice Sotomayor, joined by Justice Jackson, refused to sign onto the majority's rigid two-category rule. In her view, the majority was wrong to treat inducement and tailored-service liability as the only two ways to hold a provider responsible; ordinary common-law aiding-and-abetting principles could, in theory, reach an ISP too. She would have applied the Court's recent aiding-and-abetting framework from Twitter, Inc. v. Taamneh and Smith & Wesson Brands, Inc. v. Estados Unidos Mexicanos instead, which asks whether a defendant knowingly and culpably participated in a wrongful act so as to help make it succeed.

Even on her own broader test, Sotomayor concluded Cox still wins. Cox did not know which specific individual within a household, dormitory, or regional network was pirating; it only knew that a given IP address had been flagged. Without knowing who the actual infringer was, Cox could not be said to have intentionally helped that person succeed. Mere indifference to piracy happening somewhere on its network, she wrote, is not enough for aiding-and-abetting liability, though she warned that the majority's rule leaves ISPs free to serve known pirates without lifting a finger, effectively gutting the DMCA safe harbor's purpose going forward.

What This Means for Every Internet Service Provider and Copyright Owner

The practical effect is enormous. Copyright owners can no longer build a case against an ISP simply by proving the ISP received infringement notices and did not cut off service fast enough. They must show active inducement or a service built for piracy, both of which are far harder to prove against a mainstream internet provider. For record labels, studios, and publishers, the path forward now runs through individual infringers or through Congress, not through deep-pocketed ISPs.

Cases like this one, where a single word choice in a statute and a decades-old video-cassette-recorder ruling end up deciding a billion-dollar internet-era dispute, are exactly what ILW's Professional Certificate in Trademark, Patent & Copyright Prosecution, Opposition & Enforcement trains students and practitioners to handle. Understanding contributory liability, safe harbors, and the mechanics of secondary infringement is no longer optional for anyone building a career in IP law, media law, or technology-sector litigation.

Frequently Asked Questions

1. What did the Supreme Court decide in Cox Communications v. Sony Music Entertainment?

The Court held that Cox was not contributorily liable for its subscribers' copyright infringement because Cox neither induced the infringement nor provided a service tailored to infringement; merely knowing that some subscribers pirated content and not immediately cutting them off was not enough to create liability.

2. Was the decision unanimous?

The result was unanimous in favour of Cox, but the reasoning split. Justice Thomas wrote the majority opinion joined by six other Justices, while Justice Sotomayor, joined by Justice Jackson, concurred only in the judgment on different, common-law aiding-and-abetting grounds.

3. Does this mean ISPs can ignore piracy on their networks?

Legally, an ISP now faces little risk of contributory liability just for knowing about infringement and not acting immediately. Practically, ISPs may still choose to keep anti-piracy policies to preserve DMCA safe-harbor protection and goodwill with content owners, but the Court's ruling significantly narrows their legal exposure.

4. What are the two ways contributory copyright liability can be established?

A provider is contributorily liable only if it actively induced the infringement through specific promotional or encouraging acts, or if it sold a product or service with no substantial, commercially significant use other than infringement, as established in Sony Corp. v. Universal City Studios and Metro-Goldwyn-Mayer Studios v. Grokster.

5. Why does this case matter for law students and lawyers in India?

It is a landmark study in secondary and contributory liability, statutory safe harbors, and the limits of intermediary responsibility, principles that directly inform India's own intermediary liability rules under the IT Act and the ongoing global debate over platform accountability, and that regularly appear in IP law exams, moot courts, and interviews.

Read the full Supreme Court opinion: Cox Communications, Inc. v. Sony Music Entertainment — Official Judgment PDF

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