Complex sentence: There is to date no supranational European system for patent litigation, so the courts of each EPC Contracting State retain the final say, and vary to some extent from one to another, as to just how far the exclusion should extend.
Split into simpler sentences: There is to date no supranational European system for patent litigation, so the courts of each EPC Contracting State retain the final say. They vary to some extent from one to another as to just how far the exclusion should extend.