1 (2) (3) for the realisation of a payment or any other claim that is to be taken care of by the authority granting access. An authority requesting executive assistance or the performance of a task on commission by it or otherwise on its behalf may grant access to a secret document, if such access is indispensable for the assistance or the performance of the task. For such tasks, access to secret information may be granted also if the removal of the secret information is obviously not feasible owing to its large volume or for any other comparable reason. The authority shall ensure in advance that the arrangements for the secrecy and the protection of the information are appropriate. Section 27 — Access to archival documents (1) Access may be granted to a secret official document which has been archived in accordance with the Archives Act for research or another approved purpose, unless otherwise ordered by the authority which has sent the document to be archived. When a decision on access is made, due consideration shall be given to the safety of the freedom of scientific research. (2) The person who has gained access to the document shall undertake in writing not to use the document to the detriment or defamation of the person whom it concerns, nor to the detriment or defamation of a person close to him, nor in violation of those other interests protected by the secrecy provision. Section 28 — Official permission to gain access to a secret document (1) Unless otherwise provided in an Act, an authority may, on a case-to-case basis, grant permission to gain access to a secret document for purposes of scientific research, statistical compilations or the preparation of official plans or studies, if it is obvious that access will not violate the interests protected by the secrecy provision. When a decision on access is made, due consideration shall be given to the safety of the freedom of scientific research. If the information in the document has been handed over to the authority on the consent of the person whose interests are protected by the secrecy provision, the permission may be granted only subject to the conditions for use and access laid down in the consent. If permissions are required for documents in the possession of a number of authorities within the purview of the same ministry, the ministry shall decide on the permission, where necessary, after having heard the authorities. (2) A permission referred to in paragraph (1) above may be granted for a fixed period; the conditions necessary for the protection of the public and private interests involved shall be attached to the permission. The permission may be withdrawn, if this is deemed to be necessary. Section 29 — Granting access to secret information to some other authority (1) An authority may grant access to a secret document to some other authority, if (1) there is a specific provision on access or the right of access in an Act; (2) the person whose interests are protected by the secrecy provision consents to the same; (3) the document is necessary for the consideration of a matter pertaining to an advance tax assessment, a preliminary ruling, an appeal or a complaint against, or a submission of, a decision by an authority, or a complaint made to an international body for the administration of justice or investigation; (4) the information is required for the performance of a specific monitoring or inspection task by the authority. (2) An authority may grant another authority access to an address or other contact information which is secret by virtue of section 24(1)(31). (3) An authority may open a technical interface for another authority, to access from its personal data filing system information which the latter authority must take into account in its decision-making under a specific statutory obligation. If there is a provision on the secrecy of personal data, the interface may be used only for 13