The module contained in the DevExpress.ExpressApp.Security.v18.1.dll assembly.
The Security System Module comprises a single DevExpress.ExpressApp.Security.v18.1.dll assembly. This assembly contains classes and services that provide security and authentication related functionality in XAF applications. This assembly represents a module, since it contains the SecurityModule class - a descendant of the ModuleBase class.
The SecurityModule class exposes properties whose values determine the general behavior of security functionality. To customize these properties, select the SecurityModule component in the Application Designer's Modules section, and use the Properties window.