In many cases, data treatments are not performed when it implies sensitive data because of legal issues or fears of misuse. Another matter is the reluctance to share some data which is considered as an asset for an organization. At Ekitia we work on the creation of a framework of trust in order to make the data treatments possible. We will explain the barriers encountered and how we try to overcome them in order to create knowledge, using a three-fold approach: ethical, economical and technological. A project of Territorial Data Space is under construction and will be presented.