chores: update docs

PrivacyPolicy.md

@@ -1,26 +1,67 @@
-Privacy Policy – BetterLyrics
-Effective Date: June 3, 2025
+# Privacy Policy for BetterLyrics
 
-Thank you for using BetterLyrics.
+**Effective Date:** June 3, 2025
 
-BetterLyrics is a lyrics viewer application built with WinUI 3. We respect your privacy and are committed to protecting it. This Privacy Policy explains how we handle your data.
+Welcome to BetterLyrics ("we", "us", "our"), an application developed by Zhe Fang. We are committed to protecting your privacy. This Privacy Policy explains how we handle information when you use our BetterLyrics application (the "App").
 
-1. Personal Data Collection
-BetterLyrics does not collect, store, or transmit any personal data by default. All lyrics, preferences, and settings are stored locally on your device. We do not access or send your personal information to any server without your explicit action.
+This App is a desktop application. Your data is primarily stored locally on your device.
 
-2. Internet Usage
-BetterLyrics may connect to the internet to provide optional features, such as:
+## 1. Information We Process
 
- 	- Fetching lyrics from online sources
-	- Viewing demo content via external links
+BetterLyrics is designed to minimize data collection. We do not require you to create an account, and we do not collect personal identification information (PII) such as your name, address, or phone number.
 
-These features are strictly opt-in. The app does not perform background communication or data transmission unless you explicitly initiate it.
+To provide its core services, the App may process the following types of information:
 
-3. Third-Party Libraries
-BetterLyrics uses third-party open-source libraries (e.g., Win2D, CommunityToolkit, DevWinUI). These libraries operate locally and do not perform background tracking or data collection.
+### a) Information You Provide
+* **Apple Music Token:** If you choose to use the Apple Music lyric source, the App requires you to provide a self-generated token. This token is **stored only on your local device** and is used solely to make requests to the Apple Music API on your behalf to fetch lyrics. We do not upload or collect this token.
+* **Local Settings:** All your preferences and settings are stored locally on your device.
 
-4. Changes to This Policy
-If our privacy practices change (for example, when more online features are introduced), this policy will be updated accordingly. We will notify users through app updates or store listings.
+### b) Information Processed for Functionality
+* **Song Metadata:** To fetch lyrics, the App must send song metadata (such as the song title, artist, and album) to the third-party lyric provider you have selected. This information is sent anonymously and is not linked by us to your personal identity.
+* **Log Files:** The App automatically collects and stores log files **on your local device** for debugging and troubleshooting purposes. These logs **only contain necessary debug information** and are **not automatically uploaded** to us. We may ask you to manually provide these logs if you require technical support.
+* **Analytics:** We do **not** collect any anonymous usage statistics or analytics about how you use the App.
+* **Update Checks:** The App does **not** automatically check for new versions.
 
-5. Contact
-If you have any questions about this privacy policy, please contact us at: founchoo@outlook.com
+## 2. How We Use Information
+We use the information processed solely for the following purposes:
+* To provide and maintain the App's core functionality (i.e., fetching and displaying lyrics based on song metadata).
+* To store your configuration and credentials (like the Apple Music Token) locally, so you do not have to re-enter them.
+* To help diagnose and fix bugs via local log files (only when you manually provide them).
+
+## 3. Third-Party Services
+BetterLyrics' core functionality relies on interacting with third-party lyric providers. These services include, but are not limited to:
+
+* NetEase Cloud Music (网易云音乐)
+* QQ Music (QQ音乐)
+* Kugou Music (酷狗音乐)
+* Apple Music (requires your own token)
+* amll-ttml-db (GitHub open-source lyric database)
+* LRCLIB
+
+When you request lyrics via the App, your song metadata is sent to these services. These third parties have their own privacy policies governing their use of data. We are not responsible for the data practices of these services. We recommend you review their respective privacy policies.
+
+## 4. Information Sharing and Disclosure
+We do **not** sell, trade, or rent any of your information.
+
+As described, your sensitive information (like the Apple Music Token and logs) is stored **locally only** by default. We do not automatically access or share this information.
+
+The only exception is when you initiate a lyric request, at which point song metadata is sent to the third-party service you selected, as described in Section 3.
+
+## 5. Data Security
+We take reasonable measures to protect the information processed by the App. We specifically emphasize:
+
+* **Apple Music Token:** This sensitive credential is stored only on your local device. You are responsible for protecting the security of your device. If you suspect your token is compromised, please revoke it immediately via Apple Music and generate a new one.
+* **Local Logs:** Log files are also stored locally.
+
+As your data is primarily stored on your device, the security of that data is dependent on the security of your own device.
+
+## 6. Children's Privacy
+The App is not intended for use by children under the age of 16. We do not knowingly collect any information from children under 16.
+
+## 7. Changes to This Privacy Policy
+We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy in the App or on our GitHub repository.
+
+## 8. Contact Us
+If you have any questions about this Privacy Policy, please contact:
+Zhe Fang
+[zhefang.zf@gmail.com](mailto:zhefang.zf@gmail.com)