# Introduction

In a Mapped Security architecture, connectors perform the following tasks that are related to security:

- Connectors extract the permissions that are applied to files in a repository and add an access control list (ACL) to each document that is indexed into IDOL Server.
- Connectors add a field to each document to identify the security type. IDOL must know which security type applies to a document so that it can use the correct library to read the ACL.
- For some repositories, connectors extract group information and send it to OmniGroupServer. Connectors usually extract group information in cases where the repository uses its own system for storing users and groups. OmniGroupServer sends a `SynchronizeGroups` action to the connector when it needs group information, and the connector returns the information.

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