After winning MP3 player integrated circuit patent infringement suits at the U.S. International Trade Commission when the STMP35xx principal firmware engineer documented how SigmaTel firmware uses its dynamic voltage and frequency scaling related patents, U.S. customs physically destroyed Actions Semiconductor products at the U.S. border for intellectual property infringement. SigmaTel settled all patent litigation and in 2007 entered into a cross-licensing agreement with the Zhuhai, China-based Actions Semiconductor Co. Ltd. Both companies also agreed not to pursue possible third-party IP infringements or new legal action against each other and their respective customers for three years. Consequently, all of Actions' current and future products may be imported into the U.S. market without restrictions.