Privacy Policy

1. Introduction

Cờ Tướng Book ("we", "our", or "us") is a Xiangqi (Chinese chess) learning application. This Privacy Policy explains how we collect, use, store, and protect information when you use our app or website.

2. Information We Collect

• Account information: When you sign up, we collect your email address and a password to create and secure your account.
• Guest sessions: You may use the app without registering. We create a temporary anonymous account to save your progress and subscription status.
• Learning progress: We store which lessons and games you have completed so you can resume across devices.
• Purchase information: Subscription purchases are handled by Google Play. We receive and store a purchase token to verify and activate your subscription.
• Device/app data: We may collect anonymized crash reports and basic usage data to improve stability and performance.

3. How We Use Your Information

• To provide access to lessons, practice modes, and premium content.
• To sync your progress across devices and after reinstalls.
• To validate and restore subscriptions purchased through Google Play.
• To diagnose and fix technical issues.

4. Data Storage and Security

Your data is stored securely using industry-standard services. Passwords are never stored in plain text. We use encrypted connections and restrict access to authorized systems only.

5. Third-Party Services

We use the following third-party services:

• Google Play Billing — for processing subscriptions and in-app purchases.
• Google AdMob — to display banner and interstitial advertisements to non-subscribers. AdMob may use device identifiers to serve personalized or non-personalized ads in accordance with its own policies.
• Cloud hosting and authentication providers — to store account and progress data securely.

6. Advertising

Free users may see advertisements. Subscribers do not see ads. You can manage ad personalization through your device settings. We do not sell your personal data to advertisers.

7. Children's Privacy

Our app is not directed to children under 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us so we can remove it.

8. Your Rights

You can update your email or password from the account page. You may also request deletion of your account and associated data by contacting us.

9. Changes to This Policy

We may update this Privacy Policy from time to time. We will notify you of significant changes by updating the "Last updated" date and, when appropriate, through the app.

10. Contact Us

If you have any questions or concerns about this Privacy Policy, please contact the developer through the Google Play Store listing or the support email provided there.