California's AI Transparency Law Is Now in Effect — Here's What Changes

California's AI Transparency Law Is Now in Effect — Here's What Changes

California's landmark AI Transparency Act officially took effect today, August 2, 2026, ushering in one of the first binding U.S. rules requiring large AI companies to label content their tools generate. If you've used an AI image, video, or voice generator from a major provider recently, there's a good chance it now carries an invisible fingerprint proving where it came from. The law, known as SB 942 , has been years in the making and was deliberately timed to align with international AI enforcement efforts. Here's what actually changes today, who has to comply, and what it means for everyday users. What Is California's SB 942? SB 942, the California AI Transparency Act, requires generative AI providers with more than one million monthly users in California to disclose when content was created or altered by their systems. The law was originally signed in 2024 , but AB 853, signed in October 2025, amended it and pushed the operative date to August 2, 2026 — deliberately…