The liberalization of public networks utilities has been based on a duty to share upon the essential facilities. The rights of access and interconnection related to an essential infrastructure can be guaranteed by an administrative regulatory activity as well as by the essential facilities doctrine such as formulated by the Antitrust law. The first choice seems to contradict the aim of the opening market these sectors, that is the de-regulation of public utilities. On the other hand, the second one couldn't be enough in the promotion of a real competition in these markets. The pamphlet describes the rights of access and of interconnection to telecommunications' networks, to railways, to electroducts, to pipelines, to slots, as well as to the postal network, through the analysis of each discipline of liberalization.