Back to Home

End User License Agreement (EULA)

Effective Date: July 18, 2026

Publisher: Zhang Ming (individual developer, hereinafter the "Licensor", "we" or "us")

This Agreement is written and published in Chinese. This English text is a courtesy translation. In case of any discrepancy between this translation and the Chinese version, the Chinese version shall prevail.

1. General Provisions and Acceptance

  1. This Agreement applies to all desktop software products released on this website (including but not limited to SQLKit, collectively the "Software"), covering both the Free edition and the Pro edition.
  2. By downloading, installing, copying, activating, or otherwise using the Software, you acknowledge that you have read, understood, and agreed to be bound by all terms of this Agreement. If you do not agree to any part of this Agreement, do not download, install, or use the Software, and delete all copies you have obtained.
  3. If you use the Software on behalf of a company or other organization, you represent and warrant that you are duly authorized by that organization, and this Agreement shall be equally binding on it.

2. Definitions

  • Free Edition: the edition of the Software available without payment, whose feature scope is as published on the product page.
  • Pro Edition: the edition of the Software whose full or enhanced features are unlocked by purchasing a license.
  • License File (License): the electronic authorization credential issued by the Licensor to activate the Pro edition.
  • Machine Info (Machine Fingerprint): a string generated on your device by the Software from hardware and system parameters through irreversible processing, used solely to verify the binding between a license and a device.
  • License Term: the validity period stated in the license or indicated on the product page at the time of purchase.

3. Scope of License

  1. Subject to your compliance with this Agreement, the Licensor grants you a non-exclusive, non-transferable, non-sublicensable license to install and use the Software on the bound device during the License Term.
  2. One license may be bound to and activate one device only.
  3. This license is for use by you personally or for the internal business of your organization. Without the Licensor's written consent, you may not use the Software or the license for any external commercial service, resale, rental, or activation-on-behalf service.
  4. The Software is licensed, not sold. What you purchase is a license to use the Software, not the intellectual property rights in the Software itself.

4. License Term and Version Upgrades

  1. Licenses are offered in three types by term: 1-year, 5-year, and perpetual, subject to the product page or order information at the time of purchase.
  2. The License Term starts on the date the License File is issued. Please contact customer service promptly after purchase to complete issuance and activation.
  3. Expiration: when a 1-year or 5-year license expires, Pro features will automatically cease to be available, and you may continue to use the Free edition. Your locally stored data (connection configurations, SQL, etc.) will not be affected. Purchasing a new license reactivates the Pro edition.
  4. Version definitions: the Software uses version numbers in the form "major.minor.patch" (e.g., 1.2.3). A "major version" refers to all releases sharing the same major version number (e.g., 1.x); a change of the major version number (e.g., 1.x → 2.0) constitutes a new major version.
  5. Scope of updates:
    • 1-year and 5-year licenses: all updates actually released by the Licensor during the License Term (including new major versions released within the term) are available for use;
    • Perpetual licenses: bound to the major version current at the time of purchase; all updates within that major version (feature updates, bug fixes, and compatibility updates) are free to use permanently.
  6. Pricing of new major versions: a new major version may be released as a separately priced paid upgrade; whether it is charged and its pricing are subject to the announcement at release, and existing customers may be offered upgrade discounts at that time. The rights of purchased licenses on their original major versions are not affected in any way by the release of a new major version.
  7. Meaning of "Perpetual": a perpetual license remains valid for the bound device on an ongoing basis with no fixed expiry date; however, "perpetual" does not constitute and shall not be construed as a commitment by the Licensor to:
    • continuously develop or release new versions or features;
    • adapt the Software to all future operating system versions or hardware environments;
    • provide technical support or operational services indefinitely.
  8. If the Licensor ceases to operate the Software, issued perpetual licenses remain valid on their bound devices with the existing software versions.

5. Device Binding and Replacement

  1. A license is bound to the Machine Info submitted at activation. If verification fails due to a device change, system reinstallation, or replacement of core hardware, you may contact customer service to request a license migration. Upon verification, the Licensor will reissue a license for the remaining term of the original license.
  2. For abnormally frequent migration requests, or where there are reasonable grounds to suspect license sharing, resale, cracking, or other violations of this Agreement, the Licensor may require additional verification and may restrict or refuse the migration.

6. Prohibited Conduct

Except as expressly permitted by law, you shall not:

  1. reverse engineer, decompile, or disassemble the Software, or otherwise attempt to derive its source code;
  2. crack, bypass, interfere with, or disable the Software's license verification or feature restriction mechanisms;
  3. forge, tamper with, copy, or publicly distribute License Files or Machine Info;
  4. resell, rent, lend, or share the license with any third party;
  5. remove or alter copyright or attribution notices in the Software;
  6. use the Software for any activity that violates laws or regulations, or operate databases you are not legitimately authorized to access.

If any of the above occurs, the Licensor may immediately terminate your license without refund and reserves the right to pursue legal liability.

7. Free Edition and Feature Adjustments

  1. The feature differences between the Free and Pro editions are as published on the product page.
  2. The Licensor may adjust the feature scope of the Free edition and the allocation of features in future versions according to its product plans, provided that such adjustments do not diminish the core benefits expressly included in a purchased license during its term.
  3. Features marked as "planned" on the product page represent development intentions only and do not constitute delivery commitments. Please do not base purchase decisions on unreleased features.

8. Updates and Support

  1. The Licensor may release updates to the Software from time to time but makes no commitment as to the frequency, content, or continuity of updates. Updates may add, modify, or remove features.
  2. Technical support is provided on a reasonable-efforts basis through the contact channels published on this website and does not constitute a service-level commitment.

9. Intellectual Property

All intellectual property rights in and to the Software, including copyrights, trademarks, and technical secrets, belong to the Licensor. All rights not expressly granted to you under this Agreement are reserved by the Licensor. Third-party open-source components included in the Software are used under their respective open-source licenses.

10. Termination

  1. If you materially breach this Agreement, the Licensor may terminate your license, and fees paid will not be refunded.
  2. Upon termination, you shall stop using Pro features and delete the License File.
  3. You may terminate this Agreement at any time by ceasing to use the Software and deleting all copies; fees paid will be handled in accordance with the After-Sales & Refund Policy.

11. Disclaimer of Warranties and Limitation of Liability

  1. The Software is provided on an "as is" and "as available" basis. The Licensor makes no express or implied warranties, including warranties of merchantability, fitness for a particular purpose, or error-free or uninterrupted operation. See the Disclaimer & Usage Notice.
  2. To the maximum extent permitted by law, the Licensor's aggregate liability for all matters under this Agreement shall not exceed the total price you actually paid for the relevant license; as Free edition users pay no consideration, the Licensor assumes no liability for damages to them. The foregoing limitations do not apply where damage is caused by the Licensor's willful misconduct or gross negligence, or where mandatory provisions of law provide otherwise.
  3. The Licensor shall not be liable for any indirect losses, loss of profits, loss of data value, or business interruption losses.

12. Miscellaneous

  1. The Licensor may revise this Agreement in response to product or legal/policy changes. Revised versions take effect upon publication on this website, and material changes will be prominently notified. Continued use of the Software after revision constitutes acceptance of the revised Agreement; revisions do not affect the existing benefits of purchased licenses during their terms.
  2. The formation, validity, interpretation, and dispute resolution of this Agreement are governed by the laws of the People's Republic of China. Disputes shall first be resolved through friendly negotiation; failing that, either party may bring a lawsuit before a people's court with jurisdiction in accordance with law.
  3. EU Consumer Protection Clause: If you are a resident of the European Union / European Economic Area (EEA) and we pursue commercial activities in your Member State or direct such activities to your Member State, then pursuant to Article 6 of Regulation (EC) No 593/2008 (Rome I), the mandatory consumer protection provisions of the law of your country of habitual residence that cannot be derogated from by agreement shall prevail over the choice-of-law provision in this Article. Nothing in this Agreement shall deprive you of any mandatory consumer rights you are entitled to under applicable law.
  4. If any provision of this Agreement is held invalid, the validity of the remaining provisions shall not be affected.
  5. This Agreement, together with the Disclaimer & Usage Notice, the Privacy Policy, and the After-Sales & Refund Policy, constitutes the entire agreement between you and the Licensor.

13. Contact

If you have any questions about this Agreement, you may contact us via:

  • WeChat Official Account: 玄都洞主