On March 25, 2026, the Supreme Court handed down its decision in Cox Communications, Inc. v. Sony Music Entertainment, clarifying the boundaries of contributory copyright infringement liability. Lower courts have already applied the Cox standards in other contexts.
What the Court held: The Supreme Court reversed a contributory-infringement judgment against Cox. Mere knowledge that users infringe, even coupled with insufficient action, is not enough. Plaintiffs must prove that the provider either induced infringement through specific acts or offered a service not capable of substantial or commercially significant noninfringing uses.
Application to Cox: Cox neither induced infringement nor offered a service tailored to it. The record shows Cox provided general internet access—used for many lawful purposes—and issued warnings, suspensions, and some terminations, though plaintiffs pointed to limited terminations and internal statements.
What changed from the Fourth Circuit: The Court rejected a knowledge-plus-inaction standard as beyond Grokster and Sony, reiterating that knowledge alone cannot establish the required intent.
DMCA clarification: The DMCA safe harbors do not impose liability for serving known infringers; they provide defenses, and failing to qualify does not negate a provider’s non-infringement defense.
What this could mean beyond ISPs: While the case addresses Cox’s internet service, the framework established may apply to other platforms, including social media and AI. Key questions likely to shape future disputes include:
- Whether the service has substantial, commercially significant lawful uses;
- Whether the provider promoted or designed for infringing uses; and
- Whether meaningful guardrails (policies, warnings, enforcement) exist.
Concurrence Caution: A concurrence agreed Cox was not liable on the facts presented but cautioned that other common-law secondary-liability theories (such as aiding and abetting) may remain viable in copyright, depending on proof of intent.
This is a developing area, and the practical lines will get tested in the lower courts. For example, in Strike 3 Holdings, LLC v. Meta Platforms, Inc. (N.D. Cal. June 11, 2026), the court applied and distinguished Cox in refusing to dismiss a claim, finding the plaintiff plausibly alleging inducement by claiming that Meta “took active steps to encourage torrenting by implementing an algorithm and establishing VPCs—tools tailored to infringe copyrighted works using BitTorrent.”
We will continue to closely monitor how this standard gets applied to social media and emerging technology.
Questions about how this decision affects your business or platform? Let’s talk.