Privacy Policy
Last Updated: March 2026
1. Overview
Hundredth Sign is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your personal information in compliance with the Act on the Protection of Personal Information (個人情報保護法) of Japan and GDPR where applicable.
2. Information We Collect
We collect information you provide directly (such as name, email address, and organization details), information generated through your use of the service (such as document metadata and audit logs), and technical information (such as IP addresses and browser type).
3. How We Use Your Information
We use your information to provide and improve our services, send transactional emails (such as signature requests and notifications), comply with legal obligations, and prevent fraud and abuse.
4. Third-Party Services
We use trusted third-party services including Stripe for payment processing, AWS for document storage and email delivery, and Google OAuth for authentication. Each provider has its own privacy policy.
5. Cookies
We use essential cookies for authentication and session management. We may also use analytics cookies to improve our service. You can manage your cookie preferences using the consent banner.
6. Data Retention
We retain your account data for as long as your account is active. Signed documents and audit logs are retained for a minimum of 10 years to comply with the Electronic Books Preservation Act (電帳法). You may request deletion of your account data subject to legal obligations.
7. Your Rights
You have the right to access, correct, or delete your personal data. EU residents have additional rights under GDPR including data portability and the right to object to processing. To exercise these rights, contact us at the address below.
8. Security
We implement industry-standard security measures including AES-256 encryption at rest, TLS in transit, and WORM (Write Once Read Many) immutable audit logs.
9. Contact Us
For privacy-related inquiries, please contact us at [email protected].