However, if your application needs to have end-user (as opposed to integrator-user) What is a integrator-user?

There is also an option "c", which would be to model LicensePropertyDefinition and LicenseProperty objects in your domain model. This approach leads to a bit more work defining your model, as well as in setting up the specialists and their interactions, but the payoff is in better documentation of what your app is doing and easier re-mapping from one database type to another.

Just to check if I understand correctly - will this result in a LicenseType instance with related LicensePropertyDefinition instances. If a new License of a particular LicenseType is created LicenseProperty instances will be created based on the LicensePropertyDefinitions of the selected LicenseType. Many thanks Phillip Roché