15 implementing the provisions of the UNESCO Convention for the Safeguarding of the Intangible Cultural Heritage, with particular attention to Articles 11 to 15 of the said Convention. SEC. 20. Immovable National Cultural Treasures. Immovable national cultural treasures shall not be relocated, rebuilt, defaced or otherwise changed in a manner, which would destroy the property's dignity and authenticity, except to save such property from destruction due to natural causes. The site referred to in thIS provision may only be moved after securing a permit from the Commission or the appropriate cultural agency. SEC. 21. Indigenous Properties. - The appropriate cultural agency, in consultation with the National Commission on Indigenous Peoples, shall establish a program and promulgate regulations to assist indigenous people in preserving tl;-eir particular cultural and historical properties. SEC. 22. Renaming of Historical Streets, Buildings Designated as Cultural Treasure or Important Cultural Property. - The names of historical streets, parks, buildings, shrines, landmarks, monuments and sites designated as national cultural treasures or important cultural property shall not be allowed to be renamed by a local or national legislation, unless approved by the National Historical Institute, and only after due hearing on the matter. Furthermore, for changes of names done to historical streets, parks, buildings, shrines, landmarks, monuments, and sites prior to the effectivity of this Act, the National Historical Institute may direct the local government units to restore their original names, also after due hearing. ARTICLE VI REGULATING THE EXPORT, TRANSIT, IMPORT AND REPATRIATION OF CULTURAL PROPERTY SEC. 23. Export of Cultural Property. - Whoever desires to export cultural property registered in the Philippine Registry of Cultural Property shall adhere to the following requirements: