HSKLink Terms of Use

Announcement Date: August 16, 2026
Effective Date: August 16, 2026

These Terms of Use set forth the conditions for use of the HSKLink service and related websites, software, features, and services operated by XFC Inc. (hereinafter referred to as the “Company”), as well as the rights, obligations, and responsibilities of the Company and users.

Article 1. Purpose

The purpose of these Terms is to define the rights, obligations, responsibilities, and other necessary matters between the Company and users in connection with the use of the HSKLink service (hereinafter referred to as the “Service”) provided through hsklink.xfc.icu and related websites.

Article 2. Definitions

The terms used in these Terms shall have the following meanings:

“HSKLink” means the browser-based peer-to-peer (P2P) file transfer, text communication, voice communication, device connection, session management, and related ancillary services provided by the Company.
“User” means an individual or legal entity that agrees to these Terms and uses the Service.
“Member” means a User who creates an account in accordance with procedures prescribed by the Company or logs in using an external authentication method.
“P2P Connection” means a method by which a User’s device and another User’s device directly transmit and receive data over the Internet or a local network whenever technically possible.
“Relay Connection” means a method by which encrypted data is transmitted through a TURN server or other relay infrastructure when a direct P2P connection is difficult or unavailable due to network conditions, firewalls, NAT, or other technical reasons.
“Content” means files, text, voice, and other data transmitted by Users through the Service.
“Paid Services” means services such as Plus, Pro, Business, Enterprise, or other services provided by the Company for a separate fee.

Article 3. Posting and Amendment of the Terms

The Company shall make these Terms readily available to Users by posting them on the initial screen of the Service, in the footer, or in another easily accessible location.
The Company may amend these Terms to the extent permitted by applicable laws and regulations.
If the Company amends these Terms, it shall announce the effective date and reasons for the amendment at least seven (7) days before the effective date.
If an amendment is materially disadvantageous to Users or involves important changes, the Company shall, in principle, provide notice at least thirty (30) days before the effective date or notify Users through email or another reasonable method.
A User who does not agree to the amended Terms may discontinue use of the Service and request account termination.

Article 4. Description of the Service

The Company may provide the following services:

Browser-to-browser P2P file transfer
Text message transmission
Voice communication and voice data transmission
Device connection using QR codes, security codes, invitation links, or similar methods
Display of P2P or relay connection status
HSK-based session or connection verification features
Device authentication and trusted-device management features
Transfer history and session record features
Advanced transfer and security features for Paid Service users
Administrative and security features for companies and organizations
Other services additionally developed by the Company or provided through partnerships

Certain features of the Service may be restricted depending on the User’s device, operating system, browser, Internet environment, or subscription plan.

Article 5. Characteristics of P2P and Network Connections

HSKLink uses direct P2P connections between User devices whenever technically possible.
If direct P2P connection is unavailable or inappropriate due to the network environment, TURN servers or other relay infrastructure may be used.
The Company does not guarantee that a direct P2P connection will always be established or that a specific transmission speed will be maintained under all usage conditions.
Actual transmission speed may vary depending on the User’s Internet connection, LAN environment, device performance, browser, telecommunications provider, network congestion, use of relay servers, and other factors.
The Company may, where technically possible, provide information through the Service regarding direct connections, relay connections, connection status, and related information.

Article 6. Processing of Transmitted Content

As a general principle, the Company does not permanently store files transmitted by Users through the basic P2P file transfer functionality in the Company’s cloud storage.
However, signaling servers, TURN servers, or other communication infrastructure may be used to establish and maintain network connections.
When a relay connection is used, encrypted data may temporarily pass through servers operated by the Company or infrastructure providers used by the Company.
For purposes of providing the Service, maintaining security, responding to failures, and complying with legal obligations, the Company may process information reasonably necessary for such purposes, including session identifiers, access logs, IP addresses, device information, transmission volume, and error information.
Further details regarding the processing of personal information are governed by the Company’s separate Privacy Policy.

Article 7. User Obligations

Users shall comply with the following requirements when using the Service:

Users shall transmit only files and information that they are legally authorized to transmit.
Users shall not infringe the copyrights, trademarks, trade secrets, personal information rights, or other rights of third parties.
Users shall not transmit, without authorization, materials that are prohibited from being removed from or transferred outside a company, school, research institution, government agency, or other organization.
Users shall comply with the security policies, information protection policies, confidentiality obligations, and related agreements applicable to the organization to which they belong.
Users shall not use the Service as a means to commit crimes or other unlawful acts.
Users shall not interfere with the normal operation of the Service or the use of the Service by other Users.

Article 8. Prohibited Activities

Users shall not engage in any of the following activities:

Transmitting Content that violates applicable laws or regulations
Transmitting pornography, child or youth sexual exploitation material, or other unlawful sexual content
Transmitting unauthorized copies of movies, music, software, e-books, or other copyrighted works without permission from the copyright holder
Transmitting or distributing malware, ransomware, viruses, spyware, or other harmful programs
Unlawfully acquiring or transmitting another person’s personal information, authentication information, financial information, or similar information
Transmitting trade secrets, confidential materials, security-sensitive information, or other protected information of a company or organization to an external destination without authorization
Using the Service for phishing, fraud, hacking, account theft, or other criminal activities
Disabling, bypassing, or circumventing security functions, usage restrictions, transfer limits, or technical protection measures of the Service
Using automated programs or similar methods to create abnormal or excessive load on the Company’s servers
Interfering with another User’s use of the Service or disrupting the normal operation of the Service
Engaging in any other activity that the Company reasonably determines poses a material risk to operation of the Service or protection of Users

Article 9. Transmission of Corporate and Institutional Data

If a User belongs to a company, school, research institution, or other organization, the User is responsible for confirming that they are authorized to transmit the organization’s data through HSKLink.
Users shall not transfer internal documents, trade secrets, customer information, research materials, design drawings, source code, or other non-public information to personal or external devices without authorization from the relevant organization.
The User shall be responsible for disputes or damages arising between the User and the User’s organization as a result of such unauthorized transmission.
However, damages caused by the Company’s willful misconduct or gross negligence shall be handled in accordance with applicable laws.

Article 10. Copyright and Intellectual Property Rights

Intellectual property rights relating to the HSKLink Service, software, designs, logos, screen layouts, technical materials, and related content belong to the Company or the respective lawful rights holders.
Rights to Content transmitted by Users belong to the respective User or lawful rights holder.
Users represent and warrant that they have lawful rights in, or legitimate authority to transmit, the Content they send through the Service.
The Company may receive reports of copyright infringement and may restrict accounts, suspend use of the Service, or terminate agreements with repeat copyright infringers or Users who abuse the Service.
Copyright infringement reports may be submitted through the Company’s customer support channel or another reporting channel separately designated by the Company.

Article 11. Restriction of Service Use and Account Suspension

The Company may restrict use of the Service or suspend or terminate a Member’s account after prior notice in any of the following circumstances. However, where there is an urgent security risk or clear unlawful activity, the Company may provide notice after taking action.

Violation of these Terms
Violation of applicable laws or regulations
Confirmed transmission or distribution of illegal Content
Repeated infringement of the rights of others
Generation of abnormal or excessive load on the Service or servers
Attempts to bypass or compromise the security system of the Service
A lawful request from an investigative agency, court, or relevant administrative authority
Any other circumstance where restriction is necessary to ensure normal operation of the Service or protect other Users

Article 12. Modification and Suspension of the Service

The Company may temporarily suspend all or part of the Service in any of the following circumstances:

System inspection, maintenance, or upgrades
Server, network, or communication infrastructure failures
Service interruptions caused by external infrastructure providers such as Google Cloud
Force majeure events including natural disasters, war, or telecommunications network failures
Security incidents or discovery of significant vulnerabilities
Applicable laws, regulations, or orders from government authorities
Other circumstances where the Company determines that suspension is necessary for stable operation of the Service

Where reasonably possible, the Company shall provide prior notice of Service interruptions.

Article 13. Beta Service

The Company may provide certain services in beta form for the purpose of testing or validating new features or technologies.
Beta services may differ from formally released services in functionality, performance, data compatibility, and stability.
Features of beta services may be modified or discontinued without prior notice.
The Company recommends that Users maintain separate backups of important data while using beta services.

Article 14. Paid Services

The Company may provide various free or paid plans, including Free, Plus, Pro, Business, and Enterprise plans.
The price, subscription period, transfer limits, file-size limits, and features of each plan shall be separately disclosed within the Service.
The Company may introduce new plans or modify the configuration or pricing of existing plans.
The Company shall not make materially disadvantageous changes to an already-paid subscription period without the User’s consent.
Payments, withdrawal from purchase, refunds, and related matters concerning Paid Services shall be governed by applicable laws and the Company’s separate Refund Policy.

Article 15. Fees and Payment

Users of Paid Services shall pay applicable fees using payment methods designated by the Company.
Unless otherwise indicated, fees may include taxes required under applicable laws.
If recurring payment services are provided, the Company shall enable Users to confirm whether recurring billing is enabled and the date of the next scheduled payment.
In the event of a payment error or duplicate charge, Users may request a refund through the Company’s customer support.

Article 16. Withdrawal and Refunds

Withdrawal from purchase and refunds for Paid Services shall be governed by the Act on Consumer Protection in Electronic Commerce and other applicable laws, as well as the Company’s separate Refund Policy.
For digital services for which service provision has already commenced, the right of withdrawal may be restricted to the extent permitted by applicable laws.
Where the right of withdrawal is restricted, the Company shall provide relevant information so that the User may review such restrictions before payment.
Detailed refund standards are available in the Refund Policy accessible through the footer of the Service.

Article 17. Service Security

The Company shall make reasonable efforts to implement technical and administrative safeguards to maintain the security and stability of the Service.
Users are responsible for securely managing their accounts, security codes, invitation links, and device access permissions.
Users may be responsible for problems arising from disclosure of their security codes or invitation links to third parties.
Even where HSK or other security technologies are implemented, the Company does not guarantee absolute prevention of all forms of attack, intrusion, or information leakage.

Article 18. Liability of the Company

The Company shall comply with applicable laws and these Terms and shall make reasonable efforts to provide the Service continuously and reliably.
If a User suffers damages due to the Company’s willful misconduct or gross negligence, the Company shall be liable in accordance with applicable laws.
The Company shall not be liable for damages caused by circumstances attributable to the User, the User’s network environment, failures of third-party services, or force majeure, unless such damages are attributable to the Company.
The Company does not pre-screen or guarantee the legality, accuracy, or ownership status of Content transmitted by Users through the Service.
The Company shall not be liable for disputes arising between Users or between a User and a third party where such disputes are not attributable to the Company.

Article 19. Compensation for Damages

If the Company or a User breaches these Terms or intentionally or negligently causes damage to the other party, the responsible party shall be liable for such damage in accordance with applicable laws.

Article 20. Protection of Personal Information

The Company processes personal information obtained in connection with provision of the Service in accordance with applicable laws.
Matters concerning categories of personal information collected, purposes of use, retention periods, international transfers, third-party provision, deletion, and other privacy-related matters shall be governed by the Company’s Privacy Policy.
Certain parts of the Service infrastructure may use external cloud services such as Google Cloud.

Article 21. External Services and Infrastructure

The Company may use Google Cloud, authentication services, payment services, telecommunications services, and other third-party infrastructure to provide the Service.
Certain functions of HSKLink may be affected by service failures, policy changes, or discontinuation of services by external service providers.
The Company shall take privacy and contractual measures required under applicable laws in connection with its use of external service providers.

Article 22. Governing Law and Dispute Resolution

These Terms and any disputes arising between the Company and Users in connection with use of the Service shall be governed by the laws of the Republic of Korea.
The Company and Users shall make reasonable efforts to resolve disputes through mutual consultation.
Any dispute that cannot be resolved through consultation shall be submitted to the court having jurisdiction under the Civil Procedure Act and other applicable laws of the Republic of Korea.
Consumers may apply for mediation or dispute resolution through consumer dispute resolution bodies established under applicable laws.

Article 23. Customer Support and Rights-Infringement Reports

Inquiries regarding use of the Service, payments, refunds, personal information, copyright infringement, or reports of unlawful use may be submitted through the contact information below.

Company Name: XFC Inc.
Representative: Joo-Hyung Lee
Business Registration Number: 105-87-25573
Mail-Order Business Registration Number: 2018-Seoul Jung-gu-1484
Address: Room 1049, Donghwa Parking Building, 60 Sejong-daero 9-gil, Jung-gu, Seoul, Republic of Korea
Email: xfcinfo@gmail.com
Telephone: +82-2-322-8396
Hosting Service Provider: Google Cloud
Service URL: hsklink.xfc.icu

Supplementary Provision

These Terms shall take effect on August 16, 2026.