vCenter Backup using Backup Exec 2012 - agent licensing question

I have the following environment to backup:

2 esxi servers

1 vCenter  

1 Domain Controller 

1 Exchange 

1 Database 

1 Fileserver

Each of these servers are virtual machines including vcenter.

From what I understand, for backing up the above mentioned machines, through vCenter, I need:

4 App & DB agent licenses (for DC, Exchange, Database and vCenter through the Servers tab not through vcenter as vm)

2 VMware licenses (for both ESXi heads and file/folder and vmdk recovery of each VM)

1 Backup Exec 2012 license

Now, when I run the license assessment, I see the following:

Agent for App & DB licenses used 2 (????) - feature type AD and SQL for vcenter

Agent for VMware licenses used 1 (????) - feature type VMWare for virtual center

Agent for windows licenses used 1 (????) - server - vcenter

Backup exec 2012 licenses used 1

There are 3 problems here:

1. Only vCenter "eats" 3 licenses for SQL, AD and Windows server.

2. Neither Exchange, DC, SQL require licenses according to the license assessment. I have to mention that I have successfully backed-up these server through vcenter and I am able to see the AD entries, the Exchange mailboxes and the SQL databases.

3. Only 1 license for VMware required when I have 2 ESXi servers

I need some help on establishing the correct number o licenses required for the above backup tasks so we can assess our future purchase.

Regards,

Vlad