Adding a DMZ node does not require any additional licensing for E-Business Suite.
It is my understanding (after going through several technology audits), that if the customer is maxed out on Internet Application Server (iAS) licenses before creating a DMZ node, they will have to obtain enough iAS licenses to cover the new DMZ node if they have customized any tables/view/procedures in EBS.
Thanks for the response.
We are using R12.2 , in this version it uses weblogic ? Do we need to take separate licences for web logic?
Creating a DMZ zone is the same as creating an internal node. You don't need additional license to create the node. As mentions by mdtaylor - if you have exceeded your user license then you would need to add more users to your license. These are totally separate issues.