52 Vienna 1989 public and private sources of information and that their need for professional confidentiality is respected. (41) They will respect the copyright of journalists. (42) On the basis of arrangements between them, where necessary, and for the purpose of regular reporting, they will grant accreditation, where it is required, and multiple entry visas to journalists from other participating States, regardless of their domicile. On this basis they will reduce to a maximum of two months the period for issuing both accreditation and multiple entry visas to journalists. (43) They will facilitate the work of foreign journalists by providing relevant information, on request, on matters of practical concern, such as import regulations, taxation and accommodation. (44) They will ensure that official press conferences and, as appropriate, other similar official press events are also open to foreign journalists, upon accreditation, where this is required. (45) They will ensure in practice that persons belonging to national minorities or regional cultures on their territories can disseminate, have access to, and exchange information in their mother tongue. (…) Co-operation and exchanges in the field of culture (47) They will promote and give full effect to their cultural co-operation, inter alia through the implementation of any relevant bilateral and multilateral agreements concluded among them in the various fields of culture. (48) They will encourage non-governmental organizations interested in the field of culture to participate, together with State institutions, in the elaboration and implementation of these agreements and specific projects, as well as in the elaboration of practical measures concerning cultural exchange and co-operation. (49) They will favour the establishment, by mutual agreement, of cultural institutes or centres of other participating States on their territory. Unhindered access by the public to such institutes or centres as well as their normal functioning win be assured. (50) They will assure unhindered access by the public to cultural events organized on their territory by persons or institutions from other participating States and ensure that the organizers can use all means available in the host country to publicize such events. (51) They will facilitate and encourage direct personal contacts in the field of culture, on both an individual and a collective basis, as well as contacts between cultural institutions, associations of creative and performing artists and other organizations in order to increase the