http://www.youtube.com/v/dtJN9_nYaZg?version=3&f=user_uploads&app=youtube_gdata

In this video, you’re going to learn how to enable and customize Client Reputation on your FortiGate unit. Client Reputation is a system unique to Fortinet products that automatically analyzes individual client data and scores clients by how much of a threat their actions may pose for your network, with clear drill-down charts. You can customize parameters to flag specific actions and behaviours as smaller or greater concerns, to help your network adapt to changing threats.

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The original article/video can be found at FortiGate Cookbook – Client Reputation (5.0)