Creative Technology Ltd., a maker of portable media players, sued Apple Computer Inc. in federal court and filed a complaint with the U.S. International Trade Commission on Monday accusing the iPod maker of infringing on one of Creative’s patents.

The Singapore-based company alleged in both complaints that Apple was violating its patent on a navigation system and method for organizing and accessing music on portable players. Creative has dubbed the patent the “Zen patent,” after its brand-name Zen media players.