"APPI" Articles (4) | TIMEWELL Inc.

Running Business Apps in Your Own Cloud Tenant: Access, Data Location, and Personal Data

If you are dropping a SaaS product and building the business app yourself, my view is that it usually runs better inside your own cloud environment, your own tenant. The fifth and final article in this series covers how that differs from multi-tenant SaaS, what you gain in identity, access, data integration, and audit logs, why "who can touch the data" rather than where it sits decides whether Japan's APPI treats a vendor as an entrusted party, why choosing a Tokyo region does not remove the duty to understand foreign rules, and how operational responsibility shifts to you. It draws on NIST, AWS, the Japanese Personal Information Protection Commission's Q&A and the 2026 APPI amendment, and ISO/IEC 27001.

2026-09-29Ryuta Hamamoto

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Is Sending Personal Data to an LLM API a Cross-Border Transfer? APPI Article 28

If you put a prompt into an overseas LLM API, is that a cross-border provision under Article 28 of Japan's personal data protection act? The Commission's generative AI alert contains no reference to Article 28, to "a third party in a foreign country" or to cross-border transfers. Here is what the statute, Enforcement Rules 16, 17 and 18, the Guidelines and Q&A items Q7-53 and Q12-4 actually say.

2026-09-06Ryuta Hamamoto

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Which Government Can Reach Your Data Abroad? CLOUD Act, China's Laws, GDPR

US law says disclose "regardless of whether" the data sits inside or outside the country. GDPR Article 48 says a foreign order is enforceable only through an international agreement. Japan's cabinet has stated that the "based on laws" exemption covers Japanese law only. Here is what the texts actually say, and where we stand.

2026-09-06Ryuta Hamamoto

ZEROCK

Can You Actually Run an LLM Inside Japan? What the Providers' Own Docs Say

"Available in the Tokyo region" and "processed only in the Tokyo region" are two different claims. Read the official documentation from AWS, Microsoft and Google and a pattern shows up: the newer the model, the less likely it can stay inside Japan. Here is what the docs actually say, and which rules genuinely require domestic processing.

2026-09-05Ryuta Hamamoto