Initially each catalogue on the network can only expose metadata that is available under an open license (to be agreed), however, in the future different catalogue may license metadata differently.
Note: the data that the metadata described could have a non-open license, as it is only the metadata being federated.
Issue: how do we federate SNOMED CT where the website publishing SNOMED CT is expected to ask the users to agree to the licensing conditions of SNOMED CT before accessing the content? To be investigated. Potentially every catalogue will need to implicitly agree that licensing conditions will be