California’s SB 942 took effect August 2, requiring large providers to offer free detection tools and manifest/latent disclosures, timed to EU provenance rules. The dual-coast deadline increases pressure on frontier labs’ watermarking stacks. It matters because compliance calendars now drive product roadmaps as hard as benchmark charts do. The piece has also been circulating in social discussion among people who watch this beat. Caveat: enforcement often ramps gradually, and guidance can shift as regulators learn from first cases.