ShieldFont

ShieldFont is an open-source typeface system designed to discourage unauthorized collection of written work for AI training. It replaces words in HTML with grammatically compatible decoys, then uses OpenType rules to display the intended text to human readers. Basic scrapers that collect source text without rendering the font receive the substituted version instead. React components, build-time tools, CDN assets, and downloadable fonts support several publishing workflows. Users can generate protected versions of their own typefaces and create private substitution mappings. An optional accessibility layer reveals the original text through a browser-side puzzle, but protected blocks are not fully WCAG compliant. The defense raises scraping costs rather than providing encryption and does not stop font analysis, rendered browsers, OCR, or screenshots.