10 June 2021, Berlin: ILLUSTRATION - A screenshot of the new CovPass app on an iPhone. The federal government's application, which was developed under the leadership of IBM, can be used to store digital proof of vaccination. Photo: Christoph Dernbach/dpa

10 June 2021, Berlin: ILLUSTRATION - A screenshot of the new CovPass app on an iPhone. The federal government's application, which was developed under the leadership of IBM, can be used to store digital proof of vaccination. Photo: Christoph Dernbach/dpa

10 June 2021, Berlin: ILLUSTRATION - A screenshot of the new CovPass app on an iPhone. The federal government's application, which was developed under the leadership of IBM, can be used to store digital proof of vaccination. Photo: Christoph Dernbach/dpa

10 June 2021, Berlin: ILLUSTRATION - A screenshot of the new CovPass app on an iPhone. The federal government's application, which was developed under the leadership of IBM, can be used to store digital proof of vaccination. Photo: Christoph Dernbach/dpa

10 June 2021, Berlin: ILLUSTRATION - A screenshot of the new CovPass app on an iPhone. The federal government's application, which was developed under the leadership of IBM, can be used to store digital proof of vaccination. Photo: Christoph Dernbach/dpa

10 June 2021, North Rhine-Westphalia, Cologne: ILLUSTRATION - The CovPass app logo is seen next to a vaccination book on a smartphone. The digital Corona vaccination passport in Germany is to be launched this Thursday. (To dpa "Launch for voluntary Corona vaccination passport for smartphone") Photo: Oliver Berg/dpa

Digitales Impfzertifikat wird in Corona-WarnApp integriert Aufnahme entstanden im Juni 2021 an der Playa de Palma auf MallorcaDigitales Impfzertifikat wird in Corona-WarnApp integriert Aufnahme entstanden im Juni 2021 an der Playa de Palma auf Mallorca, Palma Mallorca Spanien Playa de Palma *** Digital vaccination certificate is integrated into Corona WarnApp Photo taken in June 2021 at the Playa de Palma in Mallorca Digital vaccination certificate is integrated into Corona WarnApp Photo taken in June 2021 at the Playa de Palma in Mallorca, Palma Mallorca Spain Playa de Palma

Digitales Impfzertifikat wird in Corona-WarnApp integriert Aufnahme entstanden im Juni 2021 an der Playa de Palma auf MallorcaDigitales Impfzertifikat wird in Corona-WarnApp integriert Aufnahme entstanden im Juni 2021 an der Playa de Palma auf Mallorca, Palma Mallorca Spanien Playa de Palma *** Digital vaccination certificate is integrated into Corona WarnApp Photo taken in June 2021 at the Playa de Palma in Mallorca Digital vaccination certificate is integrated into Corona WarnApp Photo taken in June 2021 at the Playa de Palma in Mallorca, Palma Mallorca Spain Playa de Palma

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM

A corona passport with a QR code on a mobile phone at Rotterdam the Hague airport, Netherlands on June 9, 2021. With a corona passport (digital Covid-19 certificate), the EU wants to make free travel between member states easier. With the 'Digital Green Pass' you can show that you have been vaccinated, recently tested negative or already recovered from corona. More and more countries are going yellow for the holidays. Photo by Robin Utrecht/ABACAPRESS.COM