ARTICLE · 21 JANUARY 2026

California's AB 2013 Takes Effect: Navigating AI Training Data Transparency And Trade Secret Risk

Goodwin Procter LLP

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California's AB 2013, also known as the Generative Artificial Intelligence: Training Data Transparency Act (TDTA), took effect on January 1, 2026.

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Bethany P. Withers

California's AB 2013, also known as the Generative Artificial Intelligence: Training Data Transparency Act (TDTA), took effect on January 1, 2026. In our June 2025 alert, "California's AB 2013: Generative AI Developers Must Show Their Data," we discussed the statute's core requirements and the challenges it presents for developers of generative artificial intelligence (AI) systems.

The TDTA requires AI developers to publicly post a "high-level summary" of the datasets used to train generative AI systems or services made available to the public since January 2022. The statute enumerates 12 categories of information that must be disclosed:

The sources or owners of the datasets.

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