Conniption Virtue
Conniption Virtue asked Lois McMaster Bujold:

Dear Lois, A few times, Penric twists up a message before handing it off to be delivered; I assume as a security measure. Perhaps you would be intrigued to know* about "letter locking" which is an old this-world solution for same. There are several YouTube videos and a good website about it by Jana Dambrogio. *assuming you don't already know?

Lois McMaster Bujold Less security than temporary privacy, in Pen's case, in a moment when he had no sealing wax. Nope, I had not heard of letter locking before.

Ta, L.

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