Information and communication technology systems have become indispensable parts of our lives up to become the main strategic dimension to be protected by the State. Nonetheless, we have seen so far that the technical security is not enough for protecting the global cyberspace. A valid complement (usable) to technical solutions has been found in a Societal Digital Security Culture (SDSC) as a set of collective knowledge, common practices, and intuitive common behavior about digital security that the members of a Society share.The idea is that members of the Society need to gain knowledge and experience sufficient to avoid the consequences of the limitations of technical solutions. Under this prospective, this paper's aim is to draw the attention on trust and co-partnership like two main components of the SDSC approach that can boost the security of Information Systems.