Legal notice

Publisher

The website https://kotojutsu.com is published by a private individual, in a personal and non-professional capacity. It sells nothing and shows no advertising. In accordance with article 1-1, II of the French law on confidence in the digital economy (LCEN), the publisher does not disclose their identity.

For any question, request or complaint: [email protected]

Hosting

Server run directly by the publisher, located in France.

Traffic goes through the network of Cloudflare, Inc. (101 Townsend Street, San Francisco, CA 94107, United States), which protects the site against attacks and encrypts connections.

Intellectual property

Kotojutsu's code, teaching texts, exercises and design belong to the publisher, except the third-party works listed on the Credits page, which remain under their own licence. The Japanese voices "Female" and "Male" are produced with the VOICEVOX software (VOICEVOX:No.7, VOICEVOX:玄野武宏), in accordance with each voice's terms of use. The answers of Densha, the AI assistant, are generated by OpenAI's gpt-oss-120b model (Apache 2.0 licence), run by Groq, Inc. (United States).

The line names, codes and colours are a tribute to Japan's railways: Tokyo Metro, the Tokyo Metropolitan Bureau of Transportation (Toei), the JR companies, Osaka Metro, the municipal subways of Kyoto, Nagoya and Sapporo, Keihan, Hankyū, Kintetsu and Meitetsu. Kotojutsu is not affiliated with or endorsed by any of these companies.

JLPT (Japanese-Language Proficiency Test, 日本語能力試験) is a trademark of the Japan Foundation and Japan Educational Exchanges and Services (JEES). Kotojutsu is not affiliated with or endorsed by these organisations. The site's practice tests and level lists are original content, designed to practise the exam format: they are not official papers.

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