The original SVGs request DejaVu Sans; rsvg-convert embeds/subsets the locally installed DejaVu font in PDFs so learners can print or select text. The PDFs are untagged; use the supplied complete digital text alternative for reliable screen-reader reading order. The licence notice from the installed fonts-dejavu-core package is included as dejavu-font-copyright.txt. Font rights are separate from the CC BY 4.0 licence on SubjectNest's original writing/diagrams. The SVGs include a generic sans-serif fallback if a system does not have DejaVu Sans. Verify PDF text extraction and legibility after any regeneration.