Last week, Activision filed a preemptive lawsuit against Gibson regarding a patent violation claimed by the guitar maker, after it had been a partner for three years. Activision now revealed that the argument has spilled over into retail, as Gibson is trying to block stores from selling the franchise. "Our Guitar Hero retailing partners have done nothing wrong. We will confront this and any other efforts by Gibson to wrongfully interfere with Activision's relationship with its customers and its consumers."