ShieldFont open-source tool uses same-part-of-speech substitution to interfere with AI scraping

ShieldFont has released an open-source tool that replaces about 25% of words in webpage source code with real words of the same part of speech; readers still see the original text on screen, while scrapers receive semantically altered text. The author says that in tests on 1,500 passages, 50% of passages lost their original factual claims, and when seven mainstream models reconstructed the arguments, conceptual accuracy dropped by 67%; under FineWeb-Edu filtering, about one-tenth of passages that originally passed still pass. The tool currently supports only English, must be used in the Dynamic Websites plan, and depends on JavaScript. The author says most scrapers do not execute JavaScript, and this is part of the design. Screen readers and touch exploration have not yet been tested, JAWS has not been tested, and the issue of NVDA not announcing the unlock is still being tracked.

AI overview based on source reports · Updated 8 hr ago