Fuente: Wipo "digitalization" The present disclosure relates to an apparatus, a system and a computer-implemented method for generating access policy data for controlling access to a digital twin of a physical entity of a product and a respective computer-program element, a computer-implemented method and apparatus for controlling access to a digital twin of a physical entity of a product by a decentral data consuming network node associated with a participant of a decentral network and a respective computer-program element, a computer-implemented method for processing a digital twin or a part thereof of a physical entity of a product and a respective computer-program element and a computer-implemented method for controlling access to a digital twin or a part thereof of a physical entity of a product by a decentral data consuming network node associated with a participant of a decentral network using a digital access element associated with the product and a respective computer-program element.