Last updated: April 2026
1. Introduction
AI Practice Book (hereinafter "the Service") is operated by its developer (hereinafter "we" or "us"). We respect your privacy and are committed to protecting your personal information in accordance with Japan's Act on the Protection of Personal Information (個人情報保護法).
2. Information We Collect
When you sign in with Google OAuth, we receive and store the following information from your Google account:
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Google Account ID (sub) — used as a unique identifier
We do not collect passwords. Authentication is handled entirely by Google.
3. Purpose of Use
The information collected is used solely for the following purposes:
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Providing and maintaining the Service
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User authentication and account management
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Displaying your name within the Service
4. Third-Party Disclosure
We do not sell, trade, or otherwise transfer your personal information to third parties, except in the following cases:
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When required by law or government authority
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With your explicit consent
Note: We use Google OAuth for authentication. Google's privacy policy applies to the authentication process. Please review Google's Privacy Policy at https://policies.google.com/privacy
5. Data Retention
Your personal information is retained for as long as your account remains active. If you request account deletion, your personal information will be deleted within 30 days.
6. Data Security
We implement appropriate technical and organizational measures to protect your personal information, including:
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HTTPS encryption for all communications
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JWT-based authentication with short-lived tokens
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Secure hashing of session tokens stored in the database
7. Your Rights
Under Japan's Act on the Protection of Personal Information, you have the right to:
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Access your personal information
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Request correction of inaccurate information
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Request deletion of your account and data
To exercise these rights, please contact us at the email address below.
8. Cookies and Analytics
We use Google Analytics (Google Tag Manager) to analyze usage of the Service. This may involve the use of cookies. You can opt out of Google Analytics by installing the Google Analytics Opt-out Browser Add-on.
9. Changes to This Policy
We may update this Privacy Policy from time to time. We will notify you of significant changes by updating the "Last updated" date at the top of this page.
10. Contact
If you have any questions or requests regarding this Privacy Policy or the handling of your personal information, please contact us: