Libor is the rate set by the bank statements, anticipating purchases liquidity between them. The Libor rate is the result of self-regulation. On this rate, the financial system leans to fix rates many different financial transactions. However, now many banks are sued by authorities, for manipulation. The banks made false statement or organize a cartel, producing a rate in their favor. From the condemnation of the Barclays 26 June 2012 by the Financial Services Authority (FSA), the commencement of proceedings, the constitution of the Commission to think reform Libor estimated pernicious, banks choose their strategy. Most prefer to cooperate fully in themselves investigation leading home and helping the authorities. This was the case of the Royal Bank of Scotland (RBS). Today it is the case of Société Générale (SocGen).