Those who seek professional success today have to document that they possess the latest level of knowledge. With the help of the open-source software Personal Data Locker, digital learning data can be saved, from completed online further education offers to multiple-choice tests. The program, developed by a large community of programmers, also records the course of the user's learning process, for example the research carried out and the number of mistakes made. This information can be used, say, to optimize e-learning programmes. But the users always remain in control of their information and decide themselves whom they want to forward it to.