CPLEX runs under the control of the ILOG License Manager (ILM). Before you can run any application program that calls CPLEX, you must have established a valid license that it can read. Licensing instructions are provided to you separately when you buy or upgrade CPLEX. Contact your local ILOG support department if this information has not been communicated to you or if you find that you need help in establishing your CPLEX 7.0 license.