The Green Pass (EU Digital Covid Certificate) was reconfirmed on June 13th 2022 by the European Parliament as an indispensable tool for coordinating travel safety in Europe. The subject is still debated today, although similar regulations have existed in the Old World since the 15th century. In this letter, i want to briefly recall the means used in the past to regulate the movement of people in different countries, means not different from those used toda
