The Supreme Court’s decision in Cox Communications, Inc. v. Sony Music Entertainment, 146 S. Ct. 959 (2026), is an important copyright case for creators, businesses, musicians, photographers, software owners, and other copyright holders. But it should not be read too broadly.
The decision does not mean that online copyright enforcement is dead. It does not mean that copyright owners have no remedies when their work is copied, distributed, streamed, uploaded, or misused online. And it does not give internet service providers, platforms, or users a free pass to ignore copyright law.
Instead, Cox clarifies an important point about secondary liability: a copyright holder generally needs more than evidence that a service provider knew some users were infringing and continued to provide a service capable of lawful uses.
What Happened in Cox v. Sony?
Cox involved claims against Cox Communications, an internet service provider serving approximately six million subscribers. Over a two-year period, Cox received 163,148 copyright infringement notices from MarkMonitor. Cox also had a graduated response system that included warnings, suspensions, and possible termination after repeated notices. During the relevant period, Cox terminated only 32 subscribers for infringement.
The copyright owners argued that Cox should be liable for contributory infringement because it knew subscribers were infringing and continued providing internet service.
The Supreme Court disagreed with that broad theory. The Court emphasized that contributory liability cannot rest solely on knowledge of infringement and insufficient preventive action. Cox provided general internet access, a service capable of substantial noninfringing uses, and the Court found no evidence that Cox actively encouraged infringement or designed its service primarily to facilitate infringement.
What the Decision Does — and Does Not — Mean
The most important point for copyright holders is that Cox does not eliminate copyright enforcement. It narrows one theory of secondary liability against a general internet access provider.
A copyright holder can still pursue claims for direct infringement. To prove direct infringement, the copyright owner generally must show ownership of a valid copyright and copying of original elements of the work. Direct infringement may involve violations of exclusive rights such as reproduction, distribution, public performance, public display, or creation of derivative works.
Direct infringement also does not require proof that the infringer intended to violate the law. Copyright infringement is generally treated as a strict liability offense, meaning a defendant may be liable even if the copying was not intentional.
That remains a powerful tool for copyright owners.
Secondary Liability Is Still Available — But the Evidence Matters
Cox is really about secondary liability, particularly contributory infringement.
Under the decision, a copyright holder seeking to prove contributory infringement must generally show that the defendant had knowledge of infringing activity and materially contributed to or induced the infringement. But the Supreme Court clarified that generalized knowledge that some users may infringe is not enough by itself.
Instead, copyright owners should look for stronger evidence, such as:
- specific knowledge of particular infringing acts;
- willful blindness to known infringement;
- active encouragement of infringement;
- a service designed or tailored to facilitate infringement;
- failure to act after detailed and specific infringement notices;
- communications showing intent to promote infringement;
- platform features that materially support infringing activity.
The line after Cox is not “copyright holders lose.” The line is: the theory of liability must match the facts.
The DMCA Safe Harbor Is a Defense — Not a License to Ignore Infringement
Another important part of Cox is the Court’s discussion of the Digital Millennium Copyright Act, or DMCA. The Court explained that the DMCA safe harbor provisions do not create liability. They provide defenses. In other words, failing to qualify for a DMCA safe harbor does not automatically mean the defendant is liable for infringement.
For copyright holders, that distinction matters. A service provider’s failure to qualify for safe harbor may still be important, but it does not replace the need to prove the underlying infringement claim.
This makes enforcement strategy especially important. Copyright owners should preserve notices, screenshots, URLs, timestamps, copies of infringing materials, records of takedown requests, responses from platforms, and evidence showing whether the defendant had specific knowledge or took steps to encourage or support infringement.
Copyright Enforcement Is Still Very Much Alive
After Cox, copyright owners still have meaningful enforcement options. Depending on the facts, those options may include:
- sending cease-and-desist letters;
- submitting DMCA takedown notices;
- pursuing direct infringers;
- seeking damages for unauthorized copying or distribution;
- enforcing licenses;
- negotiating settlements;
- pursuing claims against platforms or services that induce or materially contribute to infringement;
- seeking statutory damages where copyright registration supports them.
If infringement is proven, copyright owners may seek remedies under 17 U.S.C. § 504, including actual damages, infringer’s profits, or statutory damages. Statutory damages may also be increased in cases of willful infringement.
Practical Takeaway for Copyright Owners
The practical lesson from Cox is not that copyright enforcement is weaker across the board. The lesson is that copyright owners need to be more precise.
A copyright owner should ask:
- Who directly copied the work?
- Where did the infringement occur?
- Was the work registered with the Copyright Office?
- What notices were sent?
- Did the defendant have specific knowledge of infringement?
- Did the defendant encourage, induce, or materially support infringement?
- Is the defendant merely providing a general-purpose service, or is there something more?
That factual record can make a major difference.
Conclusion
Cox v. Sony limited one theory of contributory liability against an internet service provider, but it did not eliminate copyright enforcement. Copyright holders still have rights, remedies, and practical tools for protecting their work online.
The decision is a reminder that copyright enforcement should be built on evidence: ownership, copying, specific infringement, notice, platform conduct, inducement, and damages. For creators and businesses whose work is being copied online, the next step is not to assume the claim is dead. The next step is to evaluate the facts and choose the right enforcement strategy.
