"Japan to Require AI Firms to Disclose Training Data" is the headline.
The actual code says nobody has to, and nobody checks if they do.

Japan to Require AI Firms to Disclose Training Data - Japan will mandate generative-AI training-data disclosure, including for foreign firms serving the Japanese market.
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A soft-law draft became a hard-law headline somewhere between the Cabinet Office and the copy desk.
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Receipts
- Context yro.slashdot.org:
Japan is preparing a nonbinding "comply or explain" code that would urge generative AI companies
- Refutes mlex.com:
The non-binding code, discussed by an Intellectual Property Strategy Headquarters study group on intellectual-property rights in the AI era
- Refutes connectontech.bakermckenzie.com:
The Principle Code is explicitly framed as soft law. It does not impose legally binding obligations or statutory penalties.
- Refutes nippon.com:
the government will use a "comply or explain" approach, under which it will set out a nonbinding code for generative AI businesses, including system developers and service providers, allowing them to choose either to comply with the code or publicly explain why they will not comply
- Context resultsense.com:
It is non-binding and runs on comply-or-explain. Foreign providers offering AI services in Japan are covered too.
Open the Receipts Pack → What each source proves, every figure traced, and what would change our verdict.
