math licence

<p>This application respects and protects the personal information of all users. Unless otherwise specified, this app will not disclose these information to the public or provide it to third parties without your prior permission.</p> <ol> <li>This application only records learning， does not collect any personal information.</li> <li>Without your consent, this app will not provide, sell, rent, share or trade your personal information to any irrelevant third party.</li> <li>If we decide to change the content, we will publish these changes in this policy and where we think it appropriate, so that you can understand how we collect and use your personal information, who can access this information.</li> </ol>