Cox Communications v. Sony Music Entertainment
April 2, 2026
What This Decision Means for Your Business
At a Glance
In the case of Cox Communications v. Sony Music, the U.S. Supreme Court reversed the original verdict of $1 Billion against Cox— finding Cox NOT liable with the key issue being contributory copyright liability for ISPs on March 25, 2026.
Background: What Happened?
Sony Music and other major record labels sued Cox Communications, one of the largest internet service providers in the United States, claimed Cox was legally responsible for music piracy committed by its own customers.
Here is how the dispute arose:
- Sony hired a company called MarkMonitor to scan the internet for piracy. Over roughly two years, MarkMonitor sent Cox over 163,000 notices identifying specific IP addresses associated with illegal music downloading.
- Cox had a response system: it issued warnings, suspended accounts, and after 13 notices, terminated service. It also terminated subscribers for copyright violations, though far fewer than it terminated for nonpayment.
- Sony argued that Cox’s response was not aggressive enough and that, by knowingly continuing to serve subscribers who were pirating music, Cox itself became liable for copyright infringement.
- A jury agreed with Sony and awarded $1 billion in damages against Cox. The Fourth Circuit Court of Appeals upheld that verdict.
- The Supreme Court took the case to decide a single question: Can an ISP be held liable simply because it kept providing internet service to customers it knew were infringing copyrights?
The Legal Framework: Secondary Liability
Copyright law generally punishes the person who actually commits infringement. However, courts have also recognized “secondary liability” meaning a party who did not directly infringe can still be held responsible if it contributed to someone else’s infringement.
There are two recognized forms of secondary liability:
- Contributory Liability- Liability for intentionally enabling or encouraging infringement. At issue in this case.
- Vicarious Liability- Liability for directly profiting from infringement and having the ability to supervise and control the activity of the infringer. Cox was cleared of this by the Fourth Circuit and it was NOT before the Supreme Court.
The Supreme Court focused entirely on contributory liability. It identified two ways a company can be contributorily liable:
- Inducement: The company actively encouraged or promoted infringement, such as by marketing its service as a piracy tool.
- Tailored Service: The company’s service has no substantial legitimate use. It exists primarily or exclusively to enable infringement.
The Supreme Court’s Decision
The Supreme Court ruled 9-0 in favor of Cox, reversing the $1 billion verdict (7 for the majority opinion and 2 concurring) Cox was found NOT liable for contributory copyright infringement.
Why Cox Won
The Court held that simply knowing your customers are breaking the law, and continuing to serve them anyway, is not enough to make you legally responsible for their conduct. The Court found:
- Cox did not induce infringement. It never advertised, marketed, or promoted its internet service as a tool for downloading pirated music. In fact, it actively discouraged piracy through its warning and termination system.
- Cox’s service was not tailored to infringement. Broadband internet access is used for an enormous range of lawful activities, including streaming, communication, remote work, education, and is not designed specifically to enable piracy.
- Knowledge alone is not enough. The Court reaffirmed that a provider cannot be held liable based solely on the fact that it knew some users were infringing and failed to do more to stop them.
What This Means for Your Business
Key Takeaway: An ISP does not become a contributorily liable for infringement simply by providing internet access to a customer who uses it to pirate content–even if the ISP receives notices identifying that customer’s IP address.
Immediate Protections
- You are protected from liability based solely on receiving DMCA-style infringement notices and continuing to serve the account.
- Courts cannot hold you liable just because you know infringement is occurring on your network generally.
- A failure to terminate every flagged subscriber is not, by itself, evidence of intentional infringement.
What You Should Still Be Doing
While this ruling is a major win, it does not mean ISPs can ignore infringement entirely. Best practices that protect you remain important:
- Maintain a written repeat infringer policy and apply it consistently.
- Respond to DMCA notices with a systematic, documented process of warnings, escalation, and termination where appropriate.
- Do not market or brand your service in any way that could suggest you encourage or tolerate piracy.
- Keep records of your anti-infringement efforts in case you ever need to demonstrate your good-faith compliance.
The DMCA Safe Harbor—Still Worth Having
Sony argued that this ruling makes the DMCA safe harbor meaningless. The majority of the Court disagreed. The DMCA created an additional defense from liability. But, the DMCA also made clear that failure to comply with the safe-harbor rules “shall not bear adversely upon … a defense by the service provider that the service provider’s conduct is not infringing.” ISPs should still work toward DMCA compliance as a belt-and-suspenders protection.
Summary: Bottom Line for ISPs
You Are Protected From:
- Liability based solely on receiving infringement notices
- Liability for continuing to serve an account associated with an IP address flagged for infringement
- A $1 billion verdict for not terminating enough subscribers
You Should Still Avoid:
- Marketing your service as piracy-friendly or infringement-tolerant
- Designing your network specifically to facilitate infringement
- Ignoring DMCA compliance and repeat infringer policies altogether
Jason Sytsma is an attorney at Shuttleworth & Ingersoll, P.L.C., practicing in Cedar Rapids, Iowa. He advises clients on trademark, copyright, and other intellectual property matters.