Security is a growing concern to enterprise systems when they become open to e-commerce using the Internet. This is particularly severe in the e-commerce applications using knowledge management systems, which generally maintain critical information about the enterprise. Security usually affects all parts of a system and to be effective must therefore be integrated in the enterprise architecture. This paper describes CODA?a complex organic distributed architecture for modeling distributed knowledge management systems applied to business intelligence; and proposes security system architecture to be integrated to it. The foundation of the security system is a role-based access control model, which provides all the functionality required by a security system, including authentication and auditing.