Keep in mind that SYMC cannot test every product out there.. so if it is not listed, it just means it has not been tested. So it all comes down to the product supporting or following the right standards
When it comes to Web Prevent, they will need to support the ICAP requirements. If your Barracuda prodcut does support ICAP, then you would just need to enable it. Once you turn it on theintegration is pretty simple.
You will know if it works pretty quickly. Just make sure to look at the logs on both systems.
When you do turn it on, make sure to point the Barracuda server to the DLP server and make sure to identify the REQMOD setting in the url. If you don't the DLP server will not work perfectly.
icap://10.10.10.10/REQMOD
Hope this makes sense.
If this solves your questions please marked as solved.
Ronak