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The UPC will base its decisions on EU law, The UPC Agreement, the European Patent Convention (EPC), other international agreements applicable to patents and binding on all the Contracting Member States and national law (Article 24 of the UPC Agreement).

Prior user rights will, pursuant to Article 28 of the UPC Agreement, be governed by national law. Anyone who would have had prior user rights in a Contracting Member State with regard to a corresponding national patent will enjoy the same rights in that Contracting Member state in respect of a European patent or a European patent with unitary effect for the same invention.