Thanks Aga for your insights.
Quote:How I personally see it in terms of this issue.
I see it as a work of a family and, or people in the immediate environment.
It is possible, but finding all the skills within the family does not sound so common to my ears. If it was really a family affair, as it surely could have been, my next question would be "why they decide to encode/encrypt" something of family affair in first place?
And following that, why design a custom glyph-set and writing rules for it? As a form of steganography they have learned about somewhere?
Quote:It doesn't matter whether it's a doctor or a pharmacist. They all have training in this direction.
For me, it is what I have learned applied to the personal environment.
I'd argue that doctors and pharmacists in 14th-15th century had much to do with cryptography, nor with steganography. Substitution and transposition ciphers were a known quantity, while polyalphabetic ciphers were not. I am no expert, but I haven't found examples where combination of cryptography and steganography has been used together in one piece of work, like in VMS could be. New set of glyphs (as an attempt of steganography or cryptanalysis avoidance) + encryption (hide the meaning). Maybe even added two ciphers, one main plus a null cipher.
How known those techniques were to 15th century doctors and pharmacists is unknown to me. Still, yes, it is possible that we have here a well educated and curious minded doctor, with a lots of free time and secrets to hide.
Quote:The text is written accordingly in the local dialect. I don't think the encodings are very complicated, but the understanding of the dialect makes you think. This is what the passages with German text tell me, which constantly leads to discussions but is not encoded.
For me, both are present, a copy (from memory) and my own interpretation.
As far as I know, we cannot be sure that those glyphs represent letters at all. We call groups of them as vords. It is a book, so it must be text, is the reasoning. But then many the statistical analysis tools say: maybe not.
Just for fun, think if those glyphs are notes. The whole VMS is really a music book, where the combinations of the glyphs, vords, are played in different speeds or rhythms, together or not, depending what is in the line initial and the first gallows on the page. The illustrations are just for style, fun or describing something about the parts of the concerto. Could it be music? Does it follow the MTTR, first or second entropy, zipf's law? I don't know, but so far, the encoding the family has used has been elusive for a few hundred years. Unlike you, I'd characterize it "very complicated".

And just to be clear, I do not think VMS is a music book, an opera, a concerto. I have my own small and think hypothesis what those glyphs represent, and possibly that leads to text, but that is for later times.
Thanks Aga!