On March 25, 2026, the U.S. Supreme Court issued a unanimous decision in Cox Communications, Inc. v. Sony Music Entertainment that significantly tightens the standard for holding service providers liable for their users’ copyright infringement. If your software company operates a platform, provides cloud infrastructure, or offers any service that third parties might use in ways that touch copyrighted content, this ruling is worth your attention.
The background: Sony and other major music publishers sued Cox, one of the country’s largest internet service providers, claiming Cox was liable for its subscribers’ illegal music downloads. Their theory was simple: Cox knew about the infringement (it had received over 163,000 notices in a roughly two-year period) and kept providing service anyway. A jury agreed, awarding the music companies $1 billion in damages. The Fourth Circuit Court of Appeals upheld the contributory infringement finding.
The Supreme Court reversed in a 9-0 decision. Justice Thomas, writing for a seven-justice majority, held that contributory copyright infringement requires proof that the service provider intended its service to be used for infringement. And that intent can only be established in two ways: first, by evidence that the provider actively induced or encouraged infringement (think promoting your product as a tool for piracy); or second, by showing the service is “tailored to infringement,” meaning it lacks substantial legitimate commercial uses. Simply knowing that some users are infringing and continuing to provide a general-purpose service is not enough.
This is significant because for decades, many courts had allowed contributory liability based on a looser standard: that the provider knew about infringement and materially contributed to it by continuing to offer the service. That broader approach is now off the table.
For software companies, the practical takeaway is substantial. If you run a SaaS platform, a hosting service, a marketplace, or any product with user-generated content, your exposure to secondary copyright claims just got narrower. The Court made clear that offering a general-purpose tool or service to the public does not make you an infringer simply because some users misuse it. That said, this ruling does not give platforms a free pass. If your company actively encourages infringement or designs features specifically to facilitate it, the inducement and tailoring theories still apply. The line between a neutral service and one built to enable copying still matters.
It will also be interesting to see how this decision intersects with the current wave of AI copyright litigation. Companies facing secondary liability claims over AI-generated outputs will likely point to this ruling and argue that their general-purpose tools satisfy neither the inducement nor the tailoring standard. Copyright holders will counter that AI systems capable of producing recognizable copies of protected works on demand look very different from a passive internet connection. Whether generative AI platforms more closely resemble the neutral ISP in this case or the file-sharing services the Court found liable in its 2005 Grokster decision is shaping up to be one of the next major copyright battles.
If your company builds or deploys software that interacts with copyrighted content in any way, an experienced attorney can help you evaluate how this new framework affects your specific risk profile. This is one to keep an eye on.
