Also refer below thread for better understanding
https://www-secure.symantec.com/connect/forums/maskingredacting-information-dlp-incidents-and-reports
https://www-secure.symantec.com/connect/forums/how-find-incident-and-events-symantec-dlp
https://www-secure.symantec.com/connect/forums/cant-access-policies
https://www-secure.symantec.com/connect/forums/seperate-web-gui-dlp#comment-7376101