Privacy Policy
En-Links LLC ("we," "us," or "our") has established this Privacy Policy ("this Policy") to explain how user information is handled in our mobile application "denntatsu" ("the App").
1. Basic Policy
The App is designed to operate through direct device-to-device communication (Bluetooth and Wi-Fi) without going through a server. As a rule, no personal information is transmitted to or collected by any server we control. This Policy explains the data handling that can actually occur under this design.
2. About Us
- Name: En-Links LLC (合同会社エン・リンクス)
- Representative: Seita Aoki
- Address: 1-11-3F Funatsu-cho, Kagoshima City, Kagoshima Prefecture, Japan
- Contact: support@denntatsu.com
3. Information We Handle and Its Purpose
The App handles the following information on-device. None of it is transmitted to our servers.
| Type of information | Purpose / handling |
|---|---|
| Location | Obtained from the device's GPS, etc., to display the direction and distance to a distress signal in Disaster/SOS mode. Location data is shared directly with nearby devices (peer-to-peer) or, only if the user chooses to, through the device's standard share sheet (e.g., another messaging app). We never transmit it to our own servers |
| Audio (microphone) | Captured for push-to-talk voice calls and sent directly to nearby devices. Audio data is never stored or transmitted to our servers |
| Bluetooth / Wi-Fi communication data | Used to establish direct connections (pairing and communication) with nearby devices. This is used only to discover nearby devices and is not used to estimate your location |
| Camera | Used only to scan QR codes for joining a group. No captured images are stored or transmitted |
| Chat messages and disaster/SOS bulletin board posts | Stored only in an on-device local database and shared directly with nearby devices via peer-to-peer communication. Never stored on our servers, and excluded from the device's cloud backup |
| Billing information | In-app purchases use the payment functionality provided by Google Play / the App Store. Payment details (e.g., credit card numbers) are handled by the respective store operator; we never obtain them directly. Confirmation of your purchases is performed entirely on-device |
4. Disclosure to Third Parties
We do not disclose users' personal information to third parties, except as required by law.
In-app purchases involve an exchange of information with Google Play / the App Store necessary to process the purchase; this is separately governed by the privacy policies of the respective store operators (Google LLC / Apple Inc.).
5. Cookies, Tracking, Advertising, and Analytics
The App does not incorporate any third-party tracking tools such as advertising SDKs, analytics SDKs, or crash-reporting SDKs (as of July 2026).
6. Data Storage and Security
Data generated by users (chat messages, disaster/SOS bulletin board posts, etc.) is stored in an on-device local database and exchanged with nearby devices over an encrypted communication channel (device-to-device signature verification and encryption). We do not store this data externally.
7. Children's Privacy
The App is not designed for any specific age group and does not knowingly collect personal information from children.
8. User Rights
Because of the App's design, we do not hold any server-side data that identifies individual users, so there is generally no data subject to access, correction, or suspension-of-use requests under applicable data protection law. Please direct any questions to the contact address below.
9. Contact for Inquiries and Complaints
Please direct any questions or complaints regarding this Policy to the contact address listed in "2. About Us" above.
10. Changes to This Policy
We may revise this Policy in response to changes in applicable law or to the App's features. Any revised Policy takes effect once posted on this page.
11. Effective Date
Effective [month] [day], 2026.
Last updated: July 11, 2026