It is allowed to spread posters in public but not on all places. Spreading opinions, ideas and thoughts is freedom of speech and falls under Article 19 of the universal declaration of human rights. However every country has their own rules and regulations towards the spreading of posters in public.
We recommend to read your local/national laws before pasting Loesje posters. Loesje can not be held responsible for any illegal spreading of posters and only offers her posters online for people to access not for illegal actions.