California SB 942 Requires AI Firms to Build Free Public Content Detection Tools

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California's SB 942, the AI Transparency Act, was enacted in 2024 and applies to generative AI providers with over one million monthly users accessible in the state. Beyond requiring watermarking disclosures, the law mandates that covered companies build and operate a free, publicly accessible tool allowing anyone to check whether a given file was created or altered by that provider's system. The tool must accept uploaded content, return a confidence-based likelihood assessment rather than a simple yes-or-no result, and expose its functionality via an API for third-party integration. When a disclosure is detected, the tool must output system provenance data — including the provider's name, system version, and creation timestamp — but is explicitly prohibited from revealing the identity of the individual user who generated the content. The threshold definition of 'monthly visitors or users' differs from standard active-account metrics, meaning some providers may unknowingly qualify, and legal counsel is advised to determine applicability.

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