82 3. The regulation also prohibits the use of office or knowledge gained from that office for personal reasons to prejudice or harm third parties. Regulation 2 (f) Officials and experts on mission shall exercise the utmost discretion in regard to all matters of official business. Officials and experts on mission shall not communicate to any Government, entity, person or any other source any information known to them by reason of their official position that they know or ought to have known has not been made public, except as appropriate in the normal course of their duties or by authorization of the Secretary-General. If they are not appointed by the Secretary-General, such authorization shall be conferred by the body that appointed them. These obligations do not cease upon the cessation of their official functions. Commentary 1. Regulation 2 (f), which is similar to staff regulation 1.2 (i), reflects the principle that official information may not be used for private purposes, except with authorization. This flows from the idea that officials and experts on mission are obligated to regulate their conduct with the interests of the Organization only in view (see ICSAB report, para. 4) and also from the requirements of regulation 2 (e). It follows that permission must be obtained for disclosure to third parties of information that has not been made public, unless such disclosure is specifically authorized or is in the normal course of duties of the official or expert on mission. Authorization of the SecretaryGeneral is not required for officials and experts on mission who have not been appointed by the Secretary-General. Those officials and experts on mission would require the authorization of the body that had appointed them if the communication of the information was not a normal part of their duties. 2. The last sentence of the regulation provides that the obligations contained in the provision do not cease upon cessation of official functions. It may be difficult to enforce such a provision, but, at the very least, if a former official or expert on mission ignored the obligations contained in this regulation, the official file of the former official or expert on mission could be noted so as to prevent his or her re-engagement. Regulation 2 (g) Officials and experts on mission may not accept any honour, decoration, favour, gift or remuneration from any Government or non-governmental