5. Unless national law provides for specific safeguards on applicable confidentiality obligations relating to the re-use of data referred to in Article 3(1), the public sector body shall make the re-use of data provided in accordance with paragraph 3 of this Article conditional on the adherence by the re-user to a confidentiality obligation that prohibits the disclosure of any information that jeopardises the rights and interests of third parties that the re-user may have acquired despite the safeguards put in place. Re-users shall be prohibited from re-identifying any data subject to whom the data relates and shall take technical and operational measures to prevent re-identification and to notify any data breach resulting in the re-identification of the data subjects concerned to the public sector body. In the event of the unauthorised re-use of non-personal data, the re-user shall, without delay, where appropriate with the assistance of the public sector body, inform the legal persons whose rights and interests may be affected.