The Cambridge Analytca scandal was not the frst data breach that shatered users' expectatons of internet services. Many online services had similar incidents before, based on faws in ITsecurity or caused by a member of the company. All of them have one thing in common: the data breach leads to a massive risk for personal data and the user's identty. Further, the consequent damage could hardly be limited or stopped because data can be copied and shared infnitely. Therefore, preventve services

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... identty leaks has been created -so-called identty leak checkers. These services certainly help to protect individuals' digital identtes. However, the legal and technical aspects are rarely discussed. This artcle analyses these leak checking services and outlines their positve and negatve aspects. Then, focussing on the negatve aspects, it outlines guidelines for a revised version of an identty leak checker. Including both legal and technical aspects, this revised version would lead to "Efectve Informaton afer an Identty Thef" (EIDI)also the name of an actual German research project with the same acronym explained in detail in the artcle.