Key dates
- 19 Sept 2024SB 942 signed
- 13 Oct 2025AB 853 signed, delaying and extending the Act
- 2 Aug 2026Provider disclosure and detection tool duties apply
- 1 Jan 2027Large online platform duties apply
- 1 Jan 2028Capture device provenance duties apply
California AI Transparency Act
Requires large generative AI providers to embed latent provenance disclosures in synthetic content and offer a free public detection tool, with platform and device duties phased in through 2028.
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