The National Library of the Netherlands has made over the last years some great digitisation efforts. Amongst others, they have published their medieval manuscript collection and made their newspaper archive available under an open license. To make this material available they have to overcome many copyright issues. Their huge collection of material is created by many different authors. It can take years to track all the inheritors to ask for permission. For that reason they have experimented with an ‘opt-out’ model where they asked authors or inheritors to contact them when they did not want something to be published.