Original diagrams use DejaVu Sans. The actual upstream licence is dejavu-font-copyright.txt:3,859 bytes, SHA 63d3ba759d12804c5b31a9d5940d855c1820d1f5999e6b0872eb1c7ff045fbc9. Its whitespace is retained. Font terms are not replaced by the CC BY 4.0 expression licence. PDFs are searchable but untagged; exact linear/no-print/no-touch/no-sound and optional locally suitable tactile routes are in alternatives. No assistive-technology or physical-print/human clearance is claimed.