Urgent Help on Netbackup License

Hi Team ,

We procured VNB Capacity based license & recieved single license key for it.

I have 3 servers  ( 1 Master + Media ) and 2 DB servers.

I want to take DB server backup over SAN.

As per my limited understanidng , i have to share Tape drives with 2 DB servers & install them as SAN media Server.

I believe during installation of SAN media server , it will ask for License key.

But how to install SAN Media license as i didnt get any another license key ?

SHould i use same capacity based license key for installation of Medai server. It would be complaint with licensing ?

Pls help.