The Société Générale d'Affichage (SGA) has the right to interfere on what is showed on public billoards on spaces that are owned by the state. As I was asking for an autorisation to realize my billboard, the administration first had to check that out with that private society. The state has a contract with them that give them the exclusive right of advertisement billboarding in public space. They not only have the right to put up billboard all over the city, they also have the right to forbid other kind of billboards that would appear in public space.