Platform secondary liability changed significantly after the U.S. Supreme Court’s March 25, 2026 decision in Cox v. Sony. This article explains why mere knowledge plus inaction is no longer enough for contributory copyright liability, how the DMCA safe harbor works after Cox, and what the decision may mean for trademark and patent disputes involving online platforms.

False DMCA takedown on Amazon can disrupt listings and harm sales even when no copyright infringement exists. This article explains how to verify whether a notice is legally valid, when to file a DMCA counter-notice, how to use Amazon’s trademark dispute path, and when court claims like DMCA §512(f), unfair competition, or declaratory judgment may help.