3. Disclosure of trade secrets to a public sector body, the Commission, the European Central Bank or a Union body shall be required only to the extent that it is strictly necessary to achieve the purpose of a request under Article 15. In such a case, the data holder or, where they are not the same person, the trade secret holder shall identify the data which are protected as trade secrets, including in the relevant metadata. The public sector body, the Commission, the European Central Bank or the Union body shall, prior to the disclosure of trade secrets, take all necessary and appropriate technical and organisational measures to preserve the confidentiality of the trade secrets, including, as appropriate, the use of model contractual terms, technical standards and the application of codes of conduct.