There are increasing pressures for health care providers to make individual-level data readily available for research and policy making. But Canadians are more likely to allow the sharing of their personal data if they believe that their privacy is protected. A new report suggests that Canadians can be uniquely identified from their date of birth, postal code, and gender. This means if this triad of data exists in any database, even if it has no names or other identifying information, it would be possible to determine the identity of those individuals.