LibreOffice only embeds fonts that have a license permission for that [1]. That may create surprise in users when some fonts used in documents don't get embedded. Our relevant help page [2] could include information about that. For reference, some pages that MS has dedicated to this are [3], [4]. [1] https://opengrok.libreoffice.org/xref/core/vcl/source/gdi/embeddedfontshelper.cxx?r=042033f1#211 [2] https://help.libreoffice.org/7.2/en-US/text/shared/01/prop_font_embed.html [3] https://support.microsoft.com/en-us/office/about-font-license-restrictions-6be9f366-e722-4751-90a8-165e9c37e985 [4] https://docs.microsoft.com/en-us/typography/fonts/font-faq#document-embedding
The Font tab of the Document Properties dialog should also inform user on the font licensing.
Olivier Hallot committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/425d5cedb8b04e845c26bf4d1018900106e87166 tdf#141095 A note about font embeddable permissions