Privacy Policy

Hubu Tech Co., Ltd. ("we") operates the JingHu mobile application ("App"). This Privacy Policy explains how we collect, use, and protect your information when you use the App.

1. Information We Collect

1.1 Locally Processed Information (Never Uploaded)

Data Type	Purpose	Storage
Call log metadata	Identify spam calls	Device only
SMS content	Analyze spam/phishing	Device only
Phone numbers (hashed)	Match spam number database	Device only
Blocking rules	Execute user preferences	Device only
AI model inference data	Classify spam messages	Device only

1.2 Information Collected With Your Consent

Data Type	Purpose	Legal Basis
Anonymous usage statistics	Improve app performance	Consent (Firebase Analytics)
Crash reports	Fix bugs, improve stability	Consent (Firebase Crashlytics)
Premium subscription data	Process payments	Contract

2. Cloud Queries

When JingHu queries the cloud spam number database:

• Your phone creates an irreversible SHA-256 hash of the phone number
• Only the hash value is sent to our server
• The server returns a spam score for that hash
• The original phone number is never transmitted

3. Data Security

We take the following measures to protect your data:

• SQLCipher Encryption: Local database uses AES-256 encryption
• Android Keystore: Keys derived from device hardware features, securely stored
• TLS 1.3: All network communication uses the latest encryption protocol
• Certificate Pinning: Prevents man-in-the-middle attacks
• R8 Code Obfuscation: Prevents reverse engineering

4. Data Retention

• Local data: Retained on your device until you delete the app or manually clear it
• Crash reports: Retained for 90 days, then automatically deleted
• Anonymous statistics: Retained for 26 months, then automatically deleted
• Subscription data: Retained for 3 years after subscription ends (legal requirement)

5. Your Rights

Under applicable law, you have the right to:

• Right to Know: Understand what personal information we collect
• Right to Delete: Request deletion of your personal information
• Right to Correct: Request correction of inaccurate personal information
• Right to Object: Object to data processing (e.g., analytics)
• Right to Portability: Obtain your data in a structured format

To exercise these rights, contact: developer@qclb.com

6. Children's Privacy

This App is not directed at children under 13. We do not knowingly collect personal information from children. If we discover that we have inadvertently collected children's data, we will delete it immediately.

7. Third-Party Services

This App may use the following third-party services (gplay version only):

Service	Provider	Purpose	Privacy Policy
Firebase Analytics	Google	Anonymous usage statistics	Google Privacy Policy
Firebase Crashlytics	Google	Crash reporting	Google Privacy Policy

The F-Droid version does not include any third-party analytics or crash reporting services.

8. Policy Updates

We may update this Privacy Policy from time to time. Updated policies will be published on this page with a revised "Last updated" date. Significant changes will be communicated via in-app notifications.

9. Contact Us

For any questions about this Privacy Policy, please contact:

• Company: Hubu Tech Co., Ltd.
• Email: developer@qclb.com
• Website: https://qclb.com
• Privacy Policy URL: https://qclb.com/privacy