Observed Signal · Aug 13, 2026 · Technical Release · Source: t3n · Impact: 2/5 · Sentiment: Positive
Shieldfont swaps words to thwart AI scraping
Designers Isaque Seneda and copywriter Gabriel Abrucio published a white paper, "The Consent Layer," describing Shieldfont — a typeface that uses ligature-based substitutions to swap whole words in a page's HTML so the rendered text seen by humans differs from the raw DOM or page source. By replacing entire words (not just letter pairs), Shieldfont aims to cause scrapers that read source HTML to extract semantically incorrect or low-quality content. The authors report Shieldfont replaces about 24.5% of words on average; in tests with six known scrapers, 90% of Shieldfont-altered content was rejected as low-quality and not used for training. They note adversaries can bypass the technique by rendering pages and using OCR, but estimate image-based scraping is roughly 5–13× more expensive than scraping HTML.
A novel anti-scraping technique can help publishers protect textual content and degrade the quality of datasets used for training AI, but the approach is niche and can be bypassed (e.g., by OCR), so impact on the broader AdTech ecosystem is limited.
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Key Takeaways & Evidence Grounding
- Designers Isaque Seneda and copywriter Gabriel Abrucio published "The Consent Layer" introducing Shieldfont.
- Shieldfont uses ligature-style substitutions to swap entire words in HTML so displayed text differs from the scraped source.
- Shieldfont reportedly replaces about 24.5% of words on a page on average.
- In tests with six known scrapers, 90% of Shieldfont-modified content was rejected as low-quality and not used for training.
- Bypassing Shieldfont by rendering pages and using OCR is possible but estimated to be roughly 5–13× more expensive than HTML scraping.
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