Purpose – The purpose of this paper is to analyse the current status of ownership of patient information from a Lockean perspective and then present Datenherrschaft as a new model for patient ownership of patient information. Design/methodology/approach – This paper is theoretical in approach. It is based on arguments derived from Locke’s Two Treatises of Government. Legal examples of the current situation are derived from Finnish, UK and Swedish legislation. Findings – Current legislation concerning patient information is not clearly formulated (...) and so recognising a new right on the part of the patient, Datenherrschaft, would be an ethically justifiable way of remedying the issue. Research limitations/implications – The legal analysis was limited to Finland, the UK and Sweden, and so other legislation should be looked at in future research. Datenherrschaft is used as an example of an ethically justified way of regulating patient information ownership and should be analysed further. Originality/value – Patient information ownership is an issue that is not unambiguously solved in many countries, nor has it, in our view, been ethically justified. The potential solution presented in this paper is clear and has strong ethical justifications. (shrink)