In this short post i want to talk about same notable changes beginning with 126.96.36.199. Enterprise Edition is now a requiered if you want to install a database for restricted use. For example if you are using Standard Edtion for RMAN Repository then you must first upgrade this database to Enterprise Edition befor you upgrade the RMAN catalog to 188.8.131.52.
For more Information check the license guide here.
Infrastructure Repository Databases
A separate single instance Oracle Database can be installed and used as an infrastructure repository for RMAN, Oracle Enterprise Manager Cloud Control, Automatic Workload Repository (AWR) Warehouse, Global Data Services Catalog, and Grid Infrastructure Management Repository without additional license requirements, provided that all the targets are correctly licensed. It may not be used or deployed for other uses.
The infrastructure repositories for RMAN, Oracle Enterprise Manager Cloud Control, AWR Warehouse, and Global Data Services Catalog can be shared in one database, or deployed in separate databases. Enterprise Edition must be used for the infrastructure repository database(s).
If Oracle RAC is used for the infrastructure database, then Oracle RAC licenses for all servers, and Enterprise Edition licenses for all but the first server, are required.
If Data Guard is used for the infrastructure database, then an Enterprise Edition license for the standby server is required.
Also check out this Oracle Blog for more information.