AB 853 amends the California AI Transparency Act, delaying its operative date to August 2, 2026. Beginning January 1, 2027, it requires large online platforms to detect standards-compliant provenance data in distributed content, disclose AI-generated or capture-device provenance information to users, allow inspection of system provenance data, and refrain from stripping provenance data or digital signatures. It also prohibits GenAI hosting platforms from knowingly making available GenAI systems that fail to embed required latent disclosures. Beginning January 1, 2028, capture device manufacturers must provide users the option to embed latent provenance disclosures in captured content, with such disclosures enabled by default. Violations are enforceable by the Attorney General, city attorneys, or county counsel at $5,000 per violation per day.