Paper_Tracker Privacy Policy

Last Updated: July 29, 2025

We value your privacy and data security. This privacy policy explains in detail how the Paper_Tracker app collects, uses, stores, and protects your information.

## 1. Permission Usage

### 1.1 Network Permissions
- **Internet Access (INTERNET)**: Used for data communication with PC Client and transmitting serial input data stream
- **Network State Access (ACCESS_NETWORK_STATE)**: Used to detect network connection status and ensure stable device communication
- **WiFi State Access (ACCESS_WIFI_STATE)**: Used to obtain WiFi connection information and optimize device discovery and connection

### 1.2 USB Device Permissions
- **USB Permission (USB_PERMISSION)**: Used to connect and manage USB serial input devices
- **USB Host Feature (android.hardware.usb.host)**: Supports the app acting as a USB host to connect external devices

### 1.3 Background Service Permissions
- **Foreground Service (FOREGROUND_SERVICE)**: Ensures USB serial input data transmission service runs continuously in the background
- **Data Sync Service (FOREGROUND_SERVICE_DATA_SYNC)**: Used for real-time synchronization and transmission of USB serial input data
- **Notification Permission (POST_NOTIFICATIONS)**: Displays service status and connection information to users
- **Wake Lock Permission (WAKE_LOCK)**: Prevents device from entering sleep mode during data transmission

### 1.4 Storage Permissions
- **Legacy External Storage Access**: Used for temporary storage and processing of USB serial input data (if needed)

## 2. Data Collection and Use

### 2.1 Information We Collect
- **Device Information**: Only necessary device connection and network status information
- **Technical Data**: App runtime logs, error reports (used only for service improvement)
- **Usage Data**: Basic app usage statistics (does not include personally identifiable information)

### 2.2 Information We Do Not Collect
- Personally identifiable information (name, phone, email, etc.)
- Location information
- Contacts or other personal data
- Specific content captured by USB serial input devices (data used only for transmission, not stored)

## 3. Data Processing and Storage

### 3.1 Data Processing
- All USB serial input data is used only for real-time transmission, not stored locally
- Network connection information is used only to establish and maintain device connections
- App log data is stored only on local devices and not uploaded to servers

### 3.2 Data Storage
- The app does not upload user data to any remote servers
- Temporary data exists only in device memory during app runtime
- Configuration information is stored only on local devices to save user settings

## 4. Data Sharing and Disclosure

We commit to:
- Not selling, renting, or otherwise providing your personal data to any third parties
- Not sharing your information with advertisers or marketing companies
- Disclosing relevant information only when legally required

## 5. Data Security

We implement the following measures to protect your data:
- Use encryption technology to protect data transmission
- Implement access control and authentication mechanisms
- Regularly update security measures and fix vulnerabilities
- Minimize data collection and storage

## 6. User Rights

You have the right to:
- Understand how we collect and use your data
- Request deletion of app data stored on your device
- Uninstall the app and delete all related data at any time
- Contact us with privacy-related questions

## 7. Children's Privacy

This app is not specifically targeted at children under 13, and we do not knowingly collect personal information from children.

## 8. Privacy Policy Updates

We may update this privacy policy from time to time. For significant changes, we will notify you through in-app notifications.

## 9. Contact Us

If you have any questions or suggestions about this privacy policy, please contact us through:
- Email: [Your contact email]
- Feedback: In-app feedback feature

Thank you for trusting and using Paper_Tracker!