What it is
The General Understanding on AI and Copyright was compiled on 15 March 2024 by the Legal Subcommittee of the Council for Cultural Affairs’ Copyright Subdivision, after public comment. An English overview was published in May 2024, and the Agency states it is not legally binding. A Japanese-only Checklist & Guidance followed on 31 July 2024. The Agency’s page lists no further updates after August 2024.
Key points
Training: Article 30-4. Use for a “non-enjoyment” purpose, such as AI training, is in principle allowed without permission. If an enjoyment purpose also exists, permission is needed. Examples that are not purely non-enjoyment:
- Fine-tuning intended to make a model reproduce specific works (intentional overfitting).
- Collecting works as RAG input aimed at outputting their creative expression.
The proviso. Article 30-4 does not apply where use would unreasonably prejudice the copyright holder’s interests. The guidance gives two examples: copying databases for training where licenses for analysis are available on the market, and getting around robots.txt or ID and password measures that signal a plan to commercialize.
RAG and Article 47-5. Where RAG falls outside Article 30-4, it may be allowed under Article 47-5 when use of the work is incidental and minor, according to commentary by Prof. Tatsuhiro Ueno, a subcommittee member.
Outputs. Infringement requires similarity and dependence. Style alone is not protected. Dependence is generally presumed if the work was in the training data, even if the user did not know.
Authorship. Output from a simple prompt (“Draw a cat.”) is not a copyrighted work; creative human contribution can make it one.
Where to find it
- Agency for Cultural Affairs AI and copyright page (Japanese): the full text, checklist, and seminar materials.
- English overview (May 2024) on the Agency’s English copyright page. It is a summary, not the full text.
Reuse terms
The Agency’s site follows the MEXT website usage policy, which is based on PDL1.0, allows commercial use, requires attribution and edit notes, and excludes logos and third-party content. Separately, statutes themselves are not copyrighted under Article 13 of the Copyright Act.
What this means for RAG systems
- Decide the purpose of each collection. Analysis-only indexing differs from retrieval designed to output expression.
- Limit verbatim output of third-party works; short, incidental excerpts are the safer pattern.
- Respect robots.txt and access controls; bypassing them weighs against Article 30-4.
- Prefer licensed data where a market license for analysis exists.
- Keep source and license metadata for every document you ingest.
- Treat the guidance as interpretation, not law, and watch for updates.
Common mistakes
- Assuming Article 30-4 permits any AI use in Japan.
- Treating RAG as automatically equal to training.
- Relying on the English overview for detailed points that only the full Japanese text covers.
- Ignoring robots.txt for Japanese sites.
Checklist
- Purpose documented for each data collection
- Output length controls for third-party works
- robots.txt and access controls respected
- License options checked for databases
- Guidance version and date recorded
How AskDona helps
AskDona works on documents you are entitled to use and shows short, cited passages as evidence rather than reproducing whole works, which fits the incidental-use pattern the guidance describes.
Run a sample evidence-cited document check
AskDona shows the evidence; your legal team decides.
Editor’s note. This article is general information, not legal advice. The Article 47-5 point relies on a subcommittee member’s commentary. The “conditions to check” rating is our first-pass judgment, not a legal opinion.
FAQ
Is AI training legal in Japan without permission? In principle, yes, for non-enjoyment purposes under Article 30-4, subject to the unreasonable-prejudice proviso.
Does Article 30-4 cover RAG? Not when RAG is designed to output the creative expression of works. Article 47-5 may apply to incidental, minor use.
Is the guidance binding? No. The Agency says it is not legally binding.
Has it been updated since 2024? The Agency’s page lists no updates after August 2024.
References
All pages opened and checked by October 26, 2026.
| Source | What it supports |
|---|---|
| Agency for Cultural Affairs: AI and copyright | Dates of guidance and checklist; no later updates |
| Agency for Cultural Affairs: English copyright page | English overview, not legally binding |
| General Understanding on AI and Copyright: Overview (PDF) | Article 30-4, proviso, RAG, authorship |
| WIPO: Ueno commentary (PDF) | RAG and Article 47-5 |
| MEXT: Website usage policy | PDL1.0-based terms covering bunka.go.jp |
| Japanese Law Translation: Copyright Act | Art. 13 |