# Permissions Module

The Permissions Module is a custom module that runs inside the EMS server within a JVM. The Permissions Module is written using JACI, a set of APIs developed by Cloud Software Group, Inc. that you can use to create a Java module that will authorize EMS client requests.

JACI provides the interface between your code and the EMS server. JACI is a standard component of EMS, and JACI classes and interfaces are documented in `com.tibco.tibems.tibemsd.security`.

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