Former Societe Generale trader Jerome Kerviel (R) and his lawyer David Koubbi (L) leave his lawyer's office hours after the verdict in his appeals trial October 24, 2012. Former Societe Generale trader Jerome Kerviel lost his appeal on Wednesday against a three-year prison sentence for his role in France's biggest rogue-trading scandal. A Paris appeals court ruled that the 35-year-old ex-trader, who had fought to overturn a 2010 conviction for taking huge, risky bets that cost SocGen 4.9 billion euros ($6.35 billion), was responsible REUTERS/Philippe Wojazer (FRANCE - Tags: BUSINESS CRIME LAW)