Privacy Policy
Last updated: 2026-08-29
1. Who we are and scope
This Privacy Policy is published by the developer ChengYuan Chang (JiXingDa Company Taiwan) (Email: admin@jxdtw.com, backup: seantw1974@gmail.com) and applies to the following apps developed by ChengYuan Chang (JiXingDa Company Taiwan) and distributed on Google Play and the App Store, as well as this official website www.aicert-edu.com:
- AiCert：AI-901 (Android package name: com.jxdtw.ai901)
- AiCert：AIF-C01 (Android package name: com.jxdtw.aifc01)
These apps are used for AI cloud certification learning, and for website account registration and purchases.
2. Data we collect
- Account: email, password hash (plaintext passwords are never stored), user ID
- Purchase: App Store / Google Play receipt or transaction identifier; or the ECPay order number and payment result for website purchases
- Trial: a random identifier (UUID) generated by the app on first launch and stored locally, used only to prevent repeated abuse of the free trial. We do not collect, use, or link permanent device identifiers such as IMEI, IMSI, SIM serial numbers, or advertising IDs; uninstalling the app removes this identifier.
- Learning progress: stored mainly on your device (e.g. answer records); the server does not collect full learning history by default
3. Purposes
- Create and verify accounts, reset passwords, delete accounts
- Unlock / restore purchased course pack entitlements
- Provide customer support and prevent fraud
- Comply with legal obligations
4. Third parties
- Apple / Google: process in-app purchases
- ECPay: processes website payments
- Hosting and databases run on servers we operate (Taiwan)
We do not track users for advertising purposes and do not sell personal data.
5. Retention and deletion
Account data is deleted or anonymized after you close your account. Payment audit records may be retained (de-identified) for the period required by law. You can request deletion in the app under “Account → Delete account” or follow the account deletion instructions.
6. Security
Traffic uses HTTPS; passwords are stored as one-way hashes; payment keys are kept server-side only.
7. Contact
Developer: ChengYuan Chang (JiXingDa Company Taiwan) / Email: admin@jxdtw.com (backup: seantw1974@gmail.com). See also the support page.