Terms of Service & End User License Agreement

Last Updated: August 5, 2024

Effective Date: August 5, 2024

Welcome to our software and related online services. This Terms of Service & End User License Agreement (hereinafter referred to as “this Agreement”) is a legally binding agreement entered into between you (hereinafter referred to as “User” or “you”) and the software operator (hereinafter referred to as “Operator”, “we”, or “us”) regarding the download, installation, use of this software, and related online services.

Please read all contents of this Agreement carefully before registering, installing, or using this software. Once you click agree, download, install, or use this software, you are deemed to have fully understood and agreed to be bound by all the terms of this Agreement.

1. Software License & Core Restrictions

1.1 Nature of License (Licensed, Not Sold)

The Operator hereby declares that this software, its related components, and online services are “licensed, not sold.” Provided that the User fully complies with all terms of this Agreement, the Operator grants the User a personal, non-exclusive, non-transferable, non-sublicensable, limited, and revocable software license (referred to as “Limited Right of Use” within this Agreement). Users may only install, run, and use this software on legally compatible terminal devices.

1.2 License Restrictions

This clause constitutes a core binding provision of this Agreement. The User explicitly agrees and promises that under no circumstances shall they personally perform, nor assist, authorize, or condone any third party in performing the following actions:

Reverse engineering, decompiling, disassembling, cracking, modifying, translating, or adapting this software (including but not limited to client-side, server-side code, underlying protocols, and related encryption components);
Attempting in any other manner to extract, interpret, or obtain the source code, object code, or underlying operational logic of this software.

2. Intellectual Property Rights

2.1 Ownership

All intellectual property rights of this software—including but not limited to software code, object programs, interface design, interactive assets, graphics, audio and video assets, brand trademarks, built-in core artwork or text assets, patents, technical secrets, etc., as well as all derivative works related to this software—shall completely and absolutely belong to the Operator.

2.2 Reservation of Rights

Except for the limited right of use explicitly granted to the User in Section 1.1 of this Agreement, the User does not enjoy any other intellectual property rights, ownership, or property interests.

3. Account Registration, Security, and Decentralized Mechanism (Account & Decentralized Security)

3.1 User Eligibility and Age Restrictions

The User explicitly acknowledges and promises that they must be at least 18 years old when using this software and related services. If the User is under 18 years old, they must obtain the explicit consent and permission of their legal guardian (parents or other legal guardians) prior to installing and using this software.

3.2 No Direct Personally Identifiable Information

This software adheres to the highest principles of data privacy protection. During the account registration and service activation processes, the platform strictly avoids collecting any direct personally identifiable information such as the User’s email address, mobile phone number, or identity documents, except for necessary service data such as order numbers, purchase status, and registration time that are strictly required to fulfill contractual obligations (Performance of a Contract).

The system will automatically generate a unique username using a random algorithm, and the User only needs to set a login password to complete registration.
Upon successful registration, the system will publicly provide the User with a unique “Account Recovery Key”.

To fulfill regional billing compliance obligations necessary for the performance of a contract (Performance of a Contract), the system will verify the User’s coarse-grained location (such as country/region code) in a completely anonymized or localized/streaming manner, and such data is not associated with any real personal identity.

3.3 Account Recovery and Operator Liability Disclaimer

The User explicitly understands and agrees that since the platform does not collect direct personally identifiable information, and the aforementioned necessary service data (such as order numbers, registration times, etc.) cannot be used to identify or verify the User’s true identity, the “Account Recovery Key” is the sole legal credential for retrieving, resetting, or recovering an account.

If the User loses their password and fails to properly safeguard the Account Recovery Key, the Operator is technically completely unable to actively intervene, assist in resetting the password, or provide any form of account recovery service. All data loss and economic damages resulting from the loss of the mnemonic phrase or recovery key shall be borne solely by the User, and the Operator shall not be held responsible.

Notwithstanding the foregoing, to protect the legitimate rights and interests of users who cannot log in, users who downloaded and purchased a paid package directly from the official website may apply to customer service via the official website by providing the original proof of payment after confirming permanent inability to log in. For details, please refer to the “Account Cancellation and Data Erasure Mechanism” chapter of Privacy Policy.

3.4 Account Ownership and Prohibited Conduct

The account is restricted to personal, non-commercial use by the registered individual themselves, or by a specific minor child permitted to use it under the registration by a legal guardian in accordance with Section 3.1 of this Agreement.

Except for the aforementioned reasonable use between legal guardians and minor children, users are strictly prohibited from sharing, transferring, gifting, renting, pledging, lending, or selling their accounts in any form. Any account disputes, financial losses, or legal liabilities arising from a violation of this clause shall be borne by the User and the actual registrant of the account. The platform reserves the right to ban such non-compliant accounts at any time.

4. User Generated Content & Acceptable Use (UGC & Acceptable Use)

4.1 User Content Copyright & Asset Ownership

4.1.1 Full Copyright Ownership of Original Content Across All States

The ownership and copyright of any partial or whole content (including but not limited to notes, cards, documents, etc.) created, written, or generated by the User within this software and related online services shall belong to the creating User. Such copyright remains intact and inalienable under any technical or physical states, including local storage, network transmission, cloud synchronization, and server hosting.

4.1.2 Copyright Isolation of Content Shared by Third Parties

The User explicitly acknowledges and agrees that the original copyright of any content actively disclosed/shared by other third-party users (such as public notes, card sets shared by others) that the User encounters, browses, downloads, or uses in this software still completely and absolutely belongs to the user who originally created the content. The User only enjoys limited viewing, learning, or personal use permissions within the specific scope authorized by the original author or permitted by platform functions, and under no circumstances shall the User acquire any copyright or ownership of such data due to its local synchronization or storage.

4.2.1 Community Access & Publisher Identity Verification

The content publishing function of the shared community of this software and its associated websites is only open to adult users with full civil capacity.

In order to maintain community network security, prevent the dissemination of illegal or criminal content, and ensure the traceability of the publisher’s identity, users must complete age confirmation and statutory third-party identity/credit verification (including but not limited to: binding a third-party mainstream platform account verified by real-name/security risk control, or completing a compliant paid subscription/credit card verification) before using the public sharing function for the first time. If the User fails to pass the aforementioned identity verification, the platform has the right to refuse access to public sharing and community interaction functions.

The Operator has the right (but no voluntarily established statutory obligation) to conduct pre-filtering, technical screening, or post-compliance review of the content intended for public release by users. For content that violates laws and regulations, community guidelines, or is suspected of infringing third-party rights, the Operator has the right to refuse publication, immediately take it down, or implement technical blocking. Such review or filtering actions do not alleviate the independent legal responsibility that the User should bear, nor do they constitute any express or implied warranty or approval by the Operator regarding the legality of such content.

4.2.2 Intellectual Property & License Grant

The voluntary choice by a user to publicly publish any data, notes, cards, or documents generated by them to the shared community of this software and its associated websites shall be deemed as the unconditional grant by such user to the Operator of a worldwide, fully royalty-free, irrevocable, perpetual, non-exclusive license to use and disseminate.

The Operator has the right to reasonably use such public content within the scope permitted by law for purposes of maintaining system stability, troubleshooting technical faults, adapting formats according to layout needs, public display, and promotion of related functions. The aforementioned authorization does not change the original copyright ownership enjoyed by the User over the content.

4.2.3 User Sole Responsibility Statement

The platform strictly prohibits the publication of any content that violates applicable laws and regulations or infringes upon the legitimate rights and interests of third parties (including but not limited to copyright, trademark rights, patent rights, commercial secrets, right of reputation, and personal privacy). Users bear full, exclusive, and unshrinkable legal and administrative responsibility for all content they publish, disseminate, or link to within the shared community. The Operator does not make any prior express or implied warranties, endorsements, or compliance commitments regarding the content uploaded or shared by users.

4.2.4 Indemnification & Platform Right of Recourse

If the content published by the User is suspected of violating laws, regulations, or infringing third-party rights, resulting in any claims, lawsuits, administrative penalties, or any legal actions brought by any third party, judicial authority, or regulatory agency against the Operator, the User shall defend the Operator and hold the Operator harmless from any damages.

The User explicitly acknowledges and agrees that the Operator has the right to seek recourse from the User for all direct and indirect economic losses resulting from their non-compliant content. The scope of recourse includes but is not limited to:

Indemnities, fines, and administrative penalties determined by third-party claims or court judgments;
Attorney fees, litigation/arbitration fees, notarization fees, appraisal fees, and travel expenses paid by the platform as a result;
Actual loss of commercial profits suffered by the platform due to damage to brand reputation, service suspension, or removal from app stores.

The Operator has the right to take necessary measures such as deleting, blocking, or disconnecting links to suspected non-compliant content without prior notice, and has the right to impose penalties such as restriction, suspension, or termination of services on non-compliant accounts.

4.3 Malicious Activities & Content Compliance

When using this software (especially online functions involving sharing, synchronization, and collaboration), users must comply with the following rules:

System Interference Restrictions: It is strictly prohibited to exploit any known or potential system vulnerabilities (Bugs) to maliciously manipulate orders, extract platform benefits, or manipulate billing systems; it is strictly prohibited to use automated tools, crawlers, scripts, or other means to maliciously scrape platform data; it is strictly prohibited to carry out any cyber-attacks that may cause platform server overload, Denial of Service (DoS), or otherwise damage the normal operation of the platform.
Content Publishing Compliance: It is strictly prohibited to use this software or services to publish or disseminate any content that violates local laws and regulations, infringes on others’ intellectual property rights (including copyright, trademark, patent, trade secrets, etc.), or involves pornography, gambling, terrorism, hate speech, or violates others’ privacy. Otherwise, the platform has the right to immediately terminate services and erase relevant data.

5. Paid Services, Regional Pricing, & Traveler’s Grace Period

5.1 Pricing and Regional Allocation Principles

The platform’s paid package pricing adopts the principle of “Region-Based Pricing”. A billing region may cover one or more sovereign countries. The division of billing regions is primarily based on comprehensive factors such as the basic operating costs of each region, compliance costs under statutory obligations, comprehensive economic development levels, and market purchasing power. Users should purchase and activate the corresponding billing package in the region where they actually permanently or primarily reside.

Special Note: The User explicitly acknowledges and agrees that the “billing region” defined by the platform only represents its billing, settlement, and pricing standards, and does not represent the specific legal jurisdictional assignment or political sovereignty determination of the User’s data.

5.2 Traveler’s Grace Period
Section titled “5.2 Traveler’s Grace Period”

The “Traveler’s Grace Period” means that under normal circumstances, users should use the services within the permanent country or region corresponding to their purchase of paid services. During short-term cross-region travel (such as tourism or business trips), the user’s account status and paid features can remain unaffected within a reasonable limit.

Special Compliance & Technical Note: The grace period mechanism is established to ensure that when users cross different countries or jurisdictions, the system can safely and smoothly switch and apply specific compliance configurations and underlying key mechanisms of the target jurisdiction. For the specific technical implementation of encrypted data flow, regional isolation, and compliance configuration under cross-region status, please refer to Technical Whitepaper.

Day Calculation Rule: Based on Coordinated Universal Time (UTC). Within the scope of each UTC day (00:00 - 24:00), as long as the User performs a cross-region access behavior once, it will be counted as 1 cross-region day.

Short-term Cross-region Limit: Within the limit, the User’s billing package and compliance data will not migrate. The specific rules are shown in the table below:

Subscription Duration	Short-term Cross-region Traveler’s Grace Period (UTC Calendar Days)
Monthly Package	2 days/month
Quarterly Package	7 days/quarter
Annual Package	28 days/year

5.3 Long-term Cross-region Use & Account Migration

When the User’s cumulative cross-region days in a non-purchase region exceed the aforementioned “Traveler’s Grace Period” limit, the system will automatically restrict relevant paid functions (including but not limited to cloud synchronization, advanced data processing, etc.). The User must actively apply to the platform for an Account Migration, and can only resume using paid functions in the new region after successfully completing the migration procedures.

The platform allows users to apply to change their permanent region. However, to balance operating costs and technical configurations across different regions, account migration will be achieved through equivalent conversion by extending or deducting the valid days of the existing subscription. Migration is limited to 2 times per calendar year.

5.4 Payment Channels & Settlement Compliance (Payment Channels & Compliance)

All fees involved under this Agreement (including but not limited to paid package subscription fees, account migration administrative processing fees, and price difference adjustment amounts) shall be strictly determined by the specific channel through which the User downloaded and installed this software:

App Store Channels: For users who download this software through third-party app distribution platforms (including but not limited to Apple App Store, Google Play Store, etc.), relevant fees must be paid strictly through the In-App Purchase (IAP) mechanism integrated by such app stores. All payment and settlement refund behaviors of users on the aforementioned platforms will simultaneously be bound by the currently effective platform developer agreements, user terms of service, and billing rules of the corresponding app store.
Official Direct Channels: For users who download this software through the Operator’s official website or official specific distribution links, relevant fees shall be settled through compliant third-party payment tools integrated by the Operator (including but not limited to Stripe, PayPal, or other legal electronic payment channels in specific regions). Any disputes regarding fund security, deduction errors, or technical failures arising from the User’s use of the aforementioned third-party payment services shall be resolved through negotiation between the User and the third-party payment service provider in accordance with its service agreement.

6. Data Security, Encryption, and Statutory Compliance

6.1 User-Initiated Encryption and Automatic Data Synchronization Encryption

Provided that the package function purchased by the User includes this service:

Users can actively perform high-strength encryption on designated file content and/or file names on their local devices.
After the data synchronization function is enabled, the User’s data is fully encrypted locally before being uploaded to the server. The data remains in ciphertext throughout the network transmission and cloud storage processes. Without the key, the file content cannot be decrypted.

For details, please refer to the Technical Whitepaper.

6.2 Legal Compliance and Judicial Assistance

The Operator is committed to protecting user data privacy on the premise of legality and compliance. When faced with mandatory legal documents (such as court subpoenas or evidence collection orders) issued by judicial authorities or government departments with legitimate jurisdiction and in compliance with legal procedures, the Operator will evaluate strictly based on applicable laws and cooperate in accordance with the law. Subject to fulfilling statutory due process requirements in specific jurisdictions (such as court search warrants), the platform may need to cooperate with judicial authorities to perform assistance in decryption obligations under an isolated environment in accordance with the law.

The User explicitly acknowledges that, limited by technical architecture and specific legal compliance requirements of various jurisdictions, the Operator will ensure that the handling of judicial assistance requests complies with the laws of the jurisdiction corresponding to the user’s payment or migration through strict regional isolation and localized compliance configurations. For specific security architecture and compliance flow boundaries, please refer to the officially published Technical Whitepaper and Guidelines for Law Enforcement Requests.

6.3 Sole Jurisdictional Basis for Judicial Assistance

The Operator’s determination of data legal compliance and processing of judicial assistance requests shall strictly take the laws of the country or specific judicial jurisdiction (hereinafter referred to as the “Governing Jurisdiction”) corresponding to the User’s current purchase of a paid package or successful account migration as the sole basis for operational evaluation and execution.

For external law enforcement or evidence collection requests outside the Governing Jurisdiction, unless such requests are transferred by the competent authorities of the Governing Jurisdiction according to statutory procedures such as the applicable Mutual Legal Assistance Treaties (MLAT), or have obtained recognition by a ruling of a court in the Governing Jurisdiction, the platform will refuse them directly to the maximum extent permitted by applicable law. For specific data extraction boundaries, statutory procedures, and operating regulations, please refer to the officially published Guidelines for Law Enforcement Requests.

7. Disclaimers & Limitation of Liability

7.1 Provision of Services “As Is” & “As Available”

The User explicitly acknowledges and agrees that this software and online services are provided on an “As Is” and “As Available” basis. The Operator and its suppliers do not guarantee that the services will never be interrupted, completely error-free, or without vulnerabilities, nor do they make any form of express or implied warranty regarding the timeliness or security of the services (including but not limited to the exclusive exclusion of any implied warranties or conditions of merchantability, fitness for a particular purpose, and non-infringement).

7.2 Limitation of Liability and Maximum Indemnity Cap

To the maximum extent permitted by applicable law, regardless of the cause of action (including but not limited to breach of contract, tort, strict liability, or other legal theories), the overall and maximum cumulative liability cap of the Operator, its affiliates, and suppliers to the User arising from this software and related online services shall not under any circumstances exceed: the cumulative total amount of fees actually paid by the User to the Operator for using the paid packages of this software within the past 3 months prior to the date the claim request is filed.

If the User uses a free version of the service, or has not actually paid any fees within the past 3 months prior to the date the claim event occurs, the maximum amount shall not exceed $20 USD or the equivalent local currency.

8. Amendments, Suspension & Termination

8.1 Service Adjustments and Version Updates

The Operator reserves the right to make version updates, patches, or upgrades to the software, or adjust, shut down, or optimize certain online functions at any time without prior notice to users.

8.2 Penalties for Violations

If it is found that a user violates any terms of this Agreement (such as reverse engineering, illegal publication of content, sharing or transferring accounts, cross-region cheating, etc.), the Operator has the right to suspend services after taking reasonable notice; for emergency or serious breaches of contract such as malicious cyber-attacks or dissemination of seriously illegal content, the Operator reserves the right to immediately restrict functions, terminate services, and provide no refund.

9. Governing Law & Dispute Resolution

9.1 Choice of Law

The formulation, effectiveness, performance, interpretation, and any form of dispute arising from this Agreement shall be governed by the substantive laws of the country/region where the Operator’s principal place of business is located, excluding the application of any conflict of law rules.

9.2 Dispute Resolution & Arbitration

Any dispute, controversy, or claim arising out of or relating to this Agreement (including any question regarding its existence, validity, interpretation, performance, or termination) shall first be resolved through friendly negotiation between both parties. If a settlement cannot be reached through negotiation within thirty (30) days from the date one party issues a written negotiation request, the relevant dispute shall be finally resolved according to the following rules:

Small Claims Court Exception: Notwithstanding the subsequent agreement regarding mandatory arbitration, if the amount in dispute does not reach the threshold for mandatory arbitration below, or if such dispute falls completely within the jurisdiction of a competent “Small Claims Court” (or local small dispute resolution mechanism of equivalent nature) under the laws of the User’s permanent residence, either party has the right to choose to file an individual lawsuit in such small claims court. Such small claims litigation is not mandatory to enter arbitration procedures.
Binding Arbitration: For any dispute, controversy, or claim that does not fall within the aforementioned small claims exemption or where the total amount in dispute exceeds $5,000 USD (or equivalent local currency), both parties explicitly acknowledge and agree: such dispute shall and can only be submitted to the Hong Kong International Arbitration Centre (HKIAC) for final adjudication in accordance with the arbitration rules of the center in force at the time of applying for arbitration.
- Composition of the Arbitral Tribunal: The arbitral tribunal shall consist of 1 arbitrator;
- Language of Arbitration: The language to be used in the arbitration proceedings shall be English (or Mandarin Chinese upon negotiation between both parties);
- Finality of the Award: The arbitral award is final and has absolute binding legal force on both parties. Both parties hereby explicitly exclude the general jurisdiction of any national or regional courts over such disputes.
Class Action Waiver: To the maximum extent permitted by applicable law, any arbitration or litigation arising from this Agreement shall be conducted strictly on an Individual Basis. Both parties explicitly agree and promise never to initiate, join, or participate in any claims against the other party in the form of a class action, representative action, mass arbitration, or any form of consolidated litigation.
Cost of Arbitration: Unless the arbitral award explicitly determines otherwise, the party initiating arbitration shall first advance the filing and administrative fees of HKIAC. Each party shall bear its own attorney fees, expert witness fees, and other travel and administrative costs incurred in preparing for the litigation.

10. Miscellaneous

10.1 Severability

If any provision of this Agreement is determined to be invalid, illegal, or unenforceable for any reason, such provision shall be limited or eliminated to the minimum extent permitted by law, and shall not affect the legality, validity, and enforceability of the remaining provisions of this Agreement.