Mary, Queen of Scots, sealed her final missive with an intricate spiral letterlock
Ars Technica » Scientific Method 2021-12-10
Summary:
Catherine de' Medici and Elizabeth I also secured some letters with spiral locks.
Link:
https://arstechnica.com/?p=1819350From feeds:
Cyberlaw » Ars TechnicaMusic and Digital Media » Ars Technica
Berkeley Law Library -- Reference & Research Services » Ars Technica » Scientific Method