Privacy Policy

Updated: October 12, 2026

First effective date: August 7, 2024

This policy sets out the privacy practices of 北京喜浪科技有限公司 (Beijing Xilang Technology Co., Ltd.) (the “Company”). We understand the importance of your personal information, including sensitive personal information, and will make every effort to protect it. We are committed to maintaining your trust and protecting your personal information through the principles of consistent rights and responsibilities, clear purposes, choice and consent, data minimization, openness and transparency, security, and individual participation. We will take appropriate measures to protect your personal information in accordance with established industry security standards.

This privacy policy (hereinafter referred to as "this policy") applies to "3D Knots" (hereinafter referred to as "this software") and related services provided by 北京喜浪科技有限公司 (Beijing Xilang Technology Co., Ltd.). Before using relevant functions, please read this policy carefully to understand the purpose, method and scope of our processing of personal information. For the processing of personal information based on consent, we will proceed with your explicit consent and will not treat your mere opening or browsing of this software as consent. For third-party services accessed through this software, their providers will process personal information in accordance with their respective privacy policies; we will describe the third-party SDKs related to this software and their processing rules in this policy.

1. Information We Collect

(1) Mobile phone number registration, login and password management

Information collected:The mobile phone number (phone number) and SMS verification code you actively enter; when using the account and password login, setting or retrieving password functions, the account and password you enter will also be processed.

Purpose of use:The mobile phone number is used to send SMS verification codes, verify account identity, complete registration and login, and set or retrieve passwords; SMS verification codes are used to verify this operation; accounts and passwords are used for identity verification and password management. We will not use the mobile phone number provided for the above functions for other purposes not notified in this policy.

How and when we collect information:The above information is actively entered by you on the corresponding page. When you click "Get Verification Code", log in, or submit password settings, it will be submitted to our server for processing through the network. We will not upload the mobile phone number you entered just because you enter the login page. The mobile phone number comes from your initiative and is not obtained by reading the local phone number, address book or call history; the verification code is filled in through your input or the auto-fill function provided by the system, and there is no need for the software to apply for permission to read SMS messages.

Frequency of collection:Process verification code, login or password management requests initiated by you, and do not read the local phone number regularly in silent or background state for these functions. After successful login, we will save the necessary account information and login credentials to maintain the login status.

If you do not provide this information:If you do not provide a mobile phone number or verification code, you will not be able to use the corresponding mobile phone number verification function; if you do not provide an account or password, you will not be able to use the corresponding password login function. You can choose guest mode to browse basic knot content without providing a mobile phone number for this browsing function.

(2) Third-party login

When you actively choose WeChat to log in and complete the WeChat authorization, we will obtain the nickname, avatar, OpenID, UnionID and necessary authorization credentials returned by WeChat authorization to identify the account, complete the login and display the account information. You will not be able to log in using WeChat without authorization, but it does not affect your choice of other login methods or guest mode.

On iOS devices that support Apple login, when you actively choose to log in with Apple and authorize, we will process the identity credentials and account ID returned by Apple, as well as the name and email address you authorized to provide (which may be a hidden email address provided by Apple) for identity verification, account association and account information display. Without authorization, you will not be able to log in with Apple, but it will not affect other available login methods or guest mode.

(3) Third-party SDK

This product uses the following SDKs:

The following SDK involves the initialization and processing of personal information based on your corresponding authorization and actual usage scenarios. Click on the third-party privacy policy link to learn more about its processing rules.

(4) Permissions and local storage

The uses of permissions and local storage are as follows:

  1. Application private storage: used to save collection data, knot content cache, account information, login credentials and update installation packages. These functions of this software use the application private directory and do not need to read other files in your phone, nor do you need to apply for external storage read and write permissions.
  2. Network access and network status: used to load knot content, log in, request verification codes, check for updates, and determine whether the network connection is available. Network-related permissions are usually managed by the system and are not equivalent to permissions to read phone calls, contacts, or location. Server-dependent features may not be available when there is no network connection.
  3. Install application (Android only): Used to call the system installer when you actively choose to download and install updates through this software. If the system requires authorization, you will decide whether to allow it on the system interface; rejection only affects the update method, and you can still update and use other available features through the app store.

2. How we use your personal information

We will use your personal information in the following circumstances:

3. Retention and Security of Personal Information

  1. We will take necessary security measures to prevent personal information from unauthorized access, disclosure, use, modification, damage or loss, and set corresponding restrictions on access to personal information. Please keep your account, password and verification code safe and do not provide the verification code to others.
  2. Retention periods: We retain your mobile phone number and necessary account information while you use your account to provide account services. SMS verification codes are used for the current verification and are not used for subsequent identity verification after they expire or have been verified. Related request records are retained only for as long as necessary to provide verification-code services, maintain security and comply with legal obligations. Verification codes are not retained as permanent account information. Local login credentials maintain your signed-in state and are cleared when you sign out or delete your account.
  3. When you permanently delete your account, or the relevant information is no longer necessary to achieve the purpose of processing, we will delete or anonymize it in accordance with the law. Records that are required to be kept by laws and regulations will be retained only to fulfill corresponding obligations; if they cannot be deleted temporarily due to technical reasons, we will stop processing except for storage and taking necessary security protection measures.
  4. The Internet environment is not completely secure. When an incident occurs that may affect the security of your personal information, we will take remedial measures in accordance with the law and inform you of the relevant situation as required.

4. How we share, transfer and publicly disclose your personal information

We are fully aware of the legal liability we bear when illegal sharing, transfer, and public disclosure of personal information causes damage to personal information subjects. We will strictly follow the following terms for all sharing, transfer, and public disclosure of your personal information:

(1) Sharing

Respecting user privacy is one of our basic principles. We will not share your personal information with any company, organization or individual except in the following circumstances:

  1. Sharing with explicit consent: We will share your personal information with other parties with your explicit consent.
  2. We may share your personal information externally as required by judicial or administrative authorities.
  3. Third-party SDK: The SDK listed in the first part processes information within the corresponding functions and authorization scope. For specific purposes, information types and privacy policies, please see the corresponding entries.
  4. Entrusted processing: In order to complete the service you actively request, we may entrust the service provider to process the necessary information, and agree on the processing purpose, period, method, information type, protection measures and responsibilities of both parties, and supervise its processing activities. If an SMS service provider is involved, it shall only process the mobile phone number and send information within the scope required to send the verification code, and shall not use it for unrelated purposes.
  5. When providing information to other personal information processors, we will inform you of the recipient's name, contact information, processing purpose, processing method and type of personal information in accordance with the law, and obtain your separate consent when necessary.

We will sign strict confidentiality agreements with companies, organizations and individuals with whom we share personal information, requiring them to handle personal information in accordance with our instructions, this Privacy Policy and any other relevant confidentiality and security measures.

(2) Transfer

We will not transfer your personal information to any company, organization or individual, except in the following circumstances:

  1. Transfer with explicit consent: We will transfer your personal information to other parties after obtaining your explicit consent.
  2. When a merger, acquisition or bankruptcy liquidation is involved, if personal information is transferred, we will require the new company or organization that holds your personal information to continue to be bound by this privacy policy. Otherwise, we will require the company, organization or individual to re-obtain your authorization and consent.

(3) Public disclosure

We will only publicly disclose your personal information under the following circumstances:

  1. We may publicly disclose your personal information with your explicit consent or based on your active choice.
  2. If we determine that you have violated laws and regulations or seriously violated relevant agreement rules, or to protect the personal and property safety of other users or the public from infringement, we may disclose your personal information in accordance with laws and regulations or with your consent, including relevant violations and the measures we have taken against you.

5. Protection of personal information of minors

  1. We attach great importance to the protection of minors’ personal information. Our services are primarily for adults. If you are a minor, please obtain the consent of your parent or guardian before using our services or providing information to us.
  2. For situations where we collect personal information from minors using our products or services with the consent of parents or guardians, we will only use, share, transfer or disclose this information when permitted by laws and regulations, with explicit consent from parents or guardians, or when necessary to protect minors.
  3. If we discover that we have collected personal information from a minor without first obtaining verifiable parental or legal guardian consent, we will seek to appropriately process the relevant data as quickly as possible.

6. Account Deletion

You can permanently delete your account using the account deletion function in this software (path: Me → Settings → Delete Account). After deletion, you will no longer be able to use the account or its associated entitlements. We will handle the relevant personal information as described in Section 3. The confirmation screen explains account deletion and its effects on purchased services; please review it carefully before confirming.

You may also use the email address below to request access to, a copy of, correction of or deletion of your personal information, withdrawal of consent, or deletion of your account. To protect account security, we may verify necessary identity information and will respond to or process your request within 15 working days. Withdrawing consent does not affect processing already carried out on the basis of consent before its withdrawal. Features that depend on the relevant information may no longer be available after withdrawal, but other available features are not affected.

7. Notices and Revisions

  1. We may revise this privacy policy from time to time. We will not reduce your rights under this Privacy Policy without your explicit consent. We will post any changes to this policy on our page.
  2. For major changes, we will also provide more prominent notices (we will explain the specific changes to the privacy policy through, for example, emails, text messages, or special reminders on the browsing page).

8. How to contact us

If you have any questions, comments or suggestions about this privacy policy, you can contact us in the following ways:

Email: qinglixiao@163.com