For technology companies, platforms and businesses developing AI tools, Cox Communications, Inc. v. Sony Music Entertainment, 607 U.S.(2026), offers an important lesson about how a company communicates the intended use of its product.

The case involved Cox internet subscribers who used peer-to-peer networks to share copyrighted music without permission. Sony Music Entertainment and other copyright owners sent Cox more than 163,000 notices identifying IP addresses associated with suspected infringement. They argued that Cox knew repeat infringement was occurring but continued providing internet access because it wanted to retain subscriber revenue.

The Supreme Court held that this knowledge was not enough to make Cox contributorily liable. Sony also needed to show that Cox intended for its service to be used for infringement, either by encouraging unlawful conduct or supplying a service tailored to it.

Cox’s internet service had extensive lawful uses, and the company did not promote illegal file sharing. It also expressly prohibited subscribers from using their connections to infringe copyrights. Although that policy did not resolve the case by itself, it helped establish that infringement was contrary to the purpose Cox communicated for its service.

For businesses, the practical lesson begins there. Companies should state clearly that their products and services are intended for lawful use and that infringement is prohibited. Those expectations should appear in terms of service, user policies, marketing, onboarding materials and communications with customers.

The more difficult issue is whether the rest of the business supports that message. A company cannot rely on a written prohibition if its product features, marketing or growth strategy encourage the conduct its policies reject. After Cox, courts may look beyond what a company says to examine what it built, promoted and rewarded.

At Minx Law, the decision points to a broader shift: product architecture is becoming part of the legal record. The most important evidence in the next platform copyright case may not be an infringement notice. It may be the complete story the company tells through its policies, product decisions and commercial strategy.

What the Supreme Court decided.

A jury originally found Cox contributorily and vicariously liable for infringement of 10,017 copyrighted works and awarded $1 billion in statutory damages. The Fourth Circuit later reversed the vicarious-liability ruling but upheld contributory liability, reasoning that Cox continued providing internet service to subscribers it knew would use the service to infringe.

The Supreme Court rejected that approach because it treated knowledge as though it were intent.

Writing for seven Justices, Justice Thomas explained that a service provider may be contributorily liable when it actively induces infringement. In MGM Studios Inc. v. Grokster, 545 U.S. 913 (2005), for example, file-sharing companies promoted their software as a way to obtain copyrighted works and developed their business models around that use.

Liability may also arise when a company provides a service tailored to infringement because the service lacks substantial or commercially meaningful lawful uses. This principle draws from Sony Corp. of America v. Universal City Studios, 464 U.S. 417 (1984), where the Court declined to hold the manufacturer of the Betamax recorder liable because the technology was capable of legitimate uses.

Cox did not fit either category. Its service was ordinary internet access, and the company did not market or design that service as a tool for illegal file sharing. Cox may have known that some subscribers were infringing and may have had financial reasons to retain them, but neither fact established that Cox wanted the infringement to occur.

This distinction is important for executives because knowledge, financial benefit and intent are different legal concepts. A company may know that customers are misusing a product and earn revenue from those customers without necessarily intending to support the misconduct.

That does not mean the company should ignore what is happening. It means that the legal analysis will consider the company’s own conduct rather than treating user misconduct as proof of the company’s purpose.

Justice Sotomayor, joined by Justice Jackson, agreed that Cox was not liable on the evidence presented but disagreed with the majority’s narrow definition of contributory liability. She argued that traditional aiding-and-abetting principles could provide another path when a company knowingly and intentionally assists infringement.

All nine Justices therefore agreed on the result, but they did not fully agree on how courts should analyze future cases. That disagreement leaves room for further development, particularly when a provider has more information about its users or more control over how its service is used.

Policies should reflect the company’s real position.

The immediate business response to Cox should be straightforward. Companies that offer products capable of misuse should clearly explain their expectations for lawful use.

Terms of service should prohibit infringement in language appropriate to the product. User policies should explain which activities are restricted. Onboarding materials and customer communications should reinforce those expectations, particularly when a service allows users to upload, generate, distribute or monetize content.

Marketing deserves the same attention. A company should not promise responsible use in its legal terms while promoting capabilities that invite customers to reproduce protected work without permission. The inconsistency may become more important than either statement viewed alone.

Clear policies are not only defensive documents. They help establish the purpose for which the company offers its service and create a basis for responding when users depart from that purpose. They can also guide product, sales and customer-service teams when questions arise.

The policy must still be credible. A prohibition that is never communicated, monitored or enforced may provide a weaker account of the company’s intentions than one reflected throughout the business.

Companies do not need to prevent every possible infringement. General-purpose products routinely have lawful and unlawful uses, and the Supreme Court’s decision protects businesses from being treated as infringers merely because misuse is foreseeable.

They should, however, be able to explain the difference between an unwanted misuse of the product and a use the company has chosen to encourage. That explanation becomes harder when business decisions repeatedly favor the prohibited activity.