# Andrei Z. Broder — Patents explained on PatentBrief

Andrei Z. Broder has 1 landmark patent explained in plain English on PatentBrief.

- [How Websites Use Distorted Text Riddles to Stop Bots](https://patentbrief.org/patent/us/6195698/google-search-engine) — granted 2001
  This patent describes the original method for creating CAPTCHAs, using distorted text or audio riddles to distinguish human users from automated bots.

**Full profile:** https://patentbrief.org/inventor/andrei-z-broder

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_Source: PatentBrief — https://patentbrief.org. Plain-English explanations of US patents._