1. 信息收集 / Information We Collect
账户信息 / Account Information
注册时，我们仅收集您提供的用户名、昵称和密码哈希值。我们不要求手机号码、电子邮箱或其他个人身份信息。
When you register, we only collect the username, nickname, and password hash you provide. We do not require a phone number, email address, or other personally identifiable information.
消息数据 / Message Data
所有私聊消息均使用端到端加密（E2EE）保护。服务器仅存储用于投递的加密密文。群聊消息以明文形式传输和存储。
All private messages are protected with end-to-end encryption (E2EE). The server only stores ciphertext for delivery. Group-chat messages are transmitted and stored in plaintext.
设备信息 / Device Information
为进行会话管理和安全保护，我们收集浏览器类型、操作系统等基本设备信息，用于“登录设备”功能。
For session management and security, we collect basic device information such as browser type and operating system for the Devices feature.
2. 加密与安全 / Encryption & Security
PaperPhonePlus 使用 X25519 椭圆曲线密钥交换、Kyber KEM 后量子密钥封装与 Double Ratchet 前向加密协议；所有加密密钥仅存储在本地设备上。
PaperPhonePlus uses X25519 elliptic-curve key exchange, Kyber KEM post-quantum key encapsulation, and the Double Ratchet forward-secrecy protocol. Encryption keys are stored only on the local device.
3. 数据存储 / Data Storage
您的数据存储在您自行部署或选择的服务器上。PaperPhonePlus 支持自托管，我们不运营中心化数据存储服务。您可以使用消息自动删除功能清除历史消息。
Your data is stored on the server you deploy or choose. PaperPhonePlus supports self-hosting, and we do not operate a centralized data-storage service. You may clear message history with the auto-delete feature.
4. 信息共享 / Information Sharing
我们不会出售、出租或以其他方式向第三方提供您的个人信息，除非获得您的明确同意、适用法律法规要求，或为保护我们的合法权益所必需。
We do not sell, rent, or otherwise provide personal information to third parties except with your explicit consent, when required by applicable law, or when necessary to protect our legitimate interests.
5. Cookie 与本地存储 / Cookies & Local Storage
我们使用 localStorage 和 IndexedDB 保存登录状态、加密密钥和应用设置。这些数据仅保存在您的设备上，不会发送至任何第三方服务器。
We use localStorage and IndexedDB to store login state, encryption keys, and app settings. This data remains on your device and is not sent to third-party servers.
6. 未成年人保护 / Children’s Privacy
服务不面向 13 岁以下儿童。如果发现无意中收集了儿童个人信息，我们将及时采取措施删除。
The service is not directed to children under 13. If we discover that we inadvertently collected a child’s personal information, we will take steps to delete it promptly.
7. 政策更新 / Changes to This Policy
我们可能不时更新本隐私政策。更新后的政策将在应用内公布；继续使用服务即表示接受更新后的政策。
We may update this policy from time to time. Updated policies will be published in the app; continued use constitutes acceptance of the updated policy.
8. 联系我们 / Contact Us
应用：PaperPhonePlus
公司：FM619 Technolog LTD
电子邮件：[email protected]
App: PaperPhonePlus
Company: FM619 Technolog LTD
Email: [email protected]
This page is based on the Privacy Policy bundled in the PaperPhonePlus main branch.