U.S. District Judge Lucy Koh in San Jose, siding with the FTC, ruled that Qualcomm (QCOM) suppressed competition in the market for cellphone chips and used its dominant position to exact “excessive” licensing fees, The Wall Street Journal’s Tripp Mickle, Brent Kendall and Asa Fitch report. According to the ruling, which comes one month after Qualcomm struck a settlement in a separate but similar lawsuit brought by Apple (AAPL), Qualcomm violated antitrust law, charging unreasonably high royalties for its patents and eliminating rivals. “Qualcomm’s licensing practices have strangled competition” in key parts of the modem chip market for years, “and harmed rivals, OEMs, and end consumers in the process,” the judge wrote. Qualcomm has been ordered to negotiate or renegotiate licensing agreements without using unfair tactics, and must license its patents to rivals at fair prices. In pre-market trading, shares of Qualcomm are down 12.5%.