The European Data Protection Board (EDPB) and European Data Protection Supervisor (EDPS) released a joint opinion on a proposal for Digital Green Certificates to "facilitate free movement during the COVID-19 pandemic." The scope of this Joint Opinion is limited to the aspects of the proposal relating to the protection of personal data. While the Proposal is not limited to the vaccination certificates to mitigate the risk of discrimination, the EDPB and the EDPS underline the lack of an impact assessment accompanying the proposal, that would provide substantiation as to the impact of the measures being adopted as well as to the effectiveness of already existing less intrusive measures. Compliance with the principles of necessity and proportionality by the measures introduced with the proposal should carefully be analysed.