No there doesn't "need" to be. It might be useful to have a list describing owners of different wavelengths and in what areas, but until there is a dispute, the

No there doesn't "need" to be. It might be useful to have a list describing owners of different wavelengths and in what areas, but until there is a dispute, there is no problem. If a dispute arises, it can be taken to court, and the right to ownership can be settled. Such disputes can be settled like any other property right disputes in court.