PDF metadata uses non-standard `&` to separate authors (if `\and` was used in `latex_documents`)
#6897 aperta il 7 dic 2019
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Here is the relevant code: https://github.com/sphinx-doc/sphinx/blob/364f54cb5597bc6e5b619742492b4cae3067012f/sphinx/texinputs/sphinxmanual.cls#L44-L48
However, Adobe Pro apparently uses ; to separate author names. And it looks as if it also parses ,. I don't have access to such software so I can not check and my information is second-hand.
Some time recently, LaTeX package hyperref modified the behavior of its option pdfusetitle to recognize \and keyword in \author{....} input and to transform it into ; . See here.
Sphinx behavior perhaps is not quite a bug, the problem is at the time I introduced the & I has searched for some official clear guidelines on PDF author data, in case of multiple authors, and failed to find one.
I propose to adopt the ; separator.
Suggestions welcome! If no one opposes I wlll do the change in time for 2.3.0 2.4.0
Relates: #6875