As you can see in this comment, PDF metadata are not documented: https://code.google.com/p/lilypond/issues/detail?id=1463#c7
I think that this deserves an issue in the tracker. Some interesting link: 1) how to add metadata using an external tool (pdftk) http://lists.gnu.org/archive/html/lilypond-user/2010-08/msg00461.html http://jkwiens.com/2010/01/04/changing-pdf-metadata-on-ubuntu/ 2) a request to be able to add a custom field in the header and tell lilypond to export that field as metadata: http://lists.gnu.org/archive/html/lilypond-user/2013-03/msg00708.html this request was made on -user an nobody replied. You can use one of these two commands to print the metadata in a terminal: exiftool file.pdf pdftk file.pdf dump_data _______________________________________________ bug-lilypond mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-lilypond
