Hi,

you can set PDF metadata with a 'pdf' prefix as described in
https://lilypond.org/doc/v2.23/Documentation/notation/creating-output-file-metadata

The PDF Creator should be set to LilyPond {version} even when setting an
author. I tested it here:

Author:          Me
Creator:         LilyPond 2.24.3

So this is not a bug. Questions about LilyPond usage are better asked on
lilypond-u...@gnu.org.

Cheers



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