DUAL LICENCE AGREEMENT
======================
LeanLucene — Copyright (c) 2026 Jordan Rowles

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TL;DR
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  - Free for individuals, hobbyists, students, open-source projects, and
    organisations with under USD $1,000,000 annual revenue. Just keep the
    attribution.
  - Organisations at or above USD $1,000,000 annual revenue, or anyone
    redistributing this as a standalone library / SDK, need a paid
    Commercial Licence. Email jordansrowles@gmail.com.
  - Don't strip the licence, don't relicense forks, don't sue over patents,
    no warranty.

  This summary is for convenience only. The full terms below are
  authoritative.

This software is made available under a dual licensing model described below.
By using, copying, modifying, or distributing this software, you agree to the
terms of the applicable licence tier as determined by your use case.

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TIER 1 — FREE LICENCE (Community & Attribution Licence)
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You qualify for this licence if your organisation, project, or individual
has a total annual gross revenue of less than USD $1,000,000 (one million
US dollars) in the preceding twelve (12) months.

This includes (without limitation): non-commercial, educational, personal,
open-source, hobbyist, and internal-tooling use, as well as commercial use
by qualifying organisations.

GRANT OF RIGHTS (Tier 1)

Subject to the conditions below, you are granted a worldwide, royalty-free,
non-exclusive, non-sublicensable licence to:

  1. Use, copy, and run the software for any qualifying purpose;
  2. Modify the software for your own qualifying use;
  3. Distribute verbatim or modified copies of the software, provided all
     distributed copies retain this licence in full and are accompanied by
     prominent attribution as defined below;
  4. Incorporate the software as a dependency of open-source projects,
     provided the attribution requirement below is satisfied in that
     project's documentation. This clause does not require the host project
     to adopt this licence.

CONDITIONS (Tier 1)

  ATTRIBUTION REQUIREMENT
  You must include the following attribution in:
    - Any software, product, or service that uses or embeds this library;
    - Any documentation, README, or about screen made available to end users;
    - Any publication, article, or post that describes or references the library.

  Required attribution text:
    "LeanLucene by Jordan Rowles (https://github.com/jordansrowles/leanlucene)
     — used under the Community & Attribution Licence."

  You must not remove, obscure, or alter any existing copyright notice,
  licence reference, or attribution notice present in the source code or
  documentation.

  FORK & REDISTRIBUTION REQUIREMENT
  Any fork, derivative work, or modified distribution of this software must:
    (a) Carry this full dual licence document without modification;
    (b) Clearly state that the work is a derivative and identify the original
        source;
    (c) Not relicense the work or any portion of it under any other licence
        without express written permission from Jordan Rowles;
    (d) Remain subject to the same commercial use restrictions defined herein.

  Forking this repository or copying its source code does not transfer,
  waive, or modify the licensing obligations of any party. The terms of this
  agreement apply to all copies, forks, and derivatives regardless of where
  they are hosted or how they are obtained.

RESTRICTIONS (Tier 1)

  You may NOT, under the Tier 1 licence:
    - Use the software within an organisation that exceeds the revenue
      threshold defined above;
    - Sell, sublicence, or commercially redistribute the software as a
      standalone library or SDK;
    - Remove or replace this licence document with any other licence.


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TIER 2 — COMMERCIAL LICENCE
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You require this licence if any of the following are true:

  (a) Your organisation has an annual gross revenue of USD $1,000,000 or
      more in the preceding twelve (12) months;

  (b) You wish to redistribute the software as a standalone library or SDK
      to third parties;

  (c) You wish to use the software without the attribution requirements of
      Tier 1.

OBTAINING A COMMERCIAL LICENCE

  A Tier 2 Commercial Licence is granted as a one-time, perpetual licence
  for a single organisation upon payment of the applicable licence fee.

  To obtain a Commercial Licence, contact:
    Jordan Rowles
    jordansrowles@gmail.com
    https://github.com/jordansrowles/leanlucene

  Upon payment and written confirmation from Jordan Rowles, you will receive
  a signed licence certificate granting Tier 2 rights to your organisation.

GRANT OF RIGHTS (Tier 2)

  Upon receipt of a valid, paid Commercial Licence certificate, the licensed
  organisation is granted a worldwide, perpetual, irrevocable, royalty-free
  (post payment), non-sublicensable licence to:

  1. Use, copy, modify, and integrate the software into any commercial
     product or internal system operated by the licensed organisation;
  2. Deploy the software in production environments, SaaS products, and
     customer-facing systems;
  3. Create and maintain private forks and derivative works for internal use;
  4. Distribute the software as a compiled or embedded component of a larger
     product, without separately licensing the standalone library to end
     users and without the attribution obligations of Tier 1.

CONDITIONS (Tier 2)

  The Commercial Licence:
    - Is granted to a single legal entity (organisation) and is non-transferable;
    - Covers all current and future versions of LeanLucene for the licensed
      organisation;
    - Does not permit redistribution of the source code as a standalone
      library under any terms other than this dual licence;
    - Does not grant the licensee the right to sub-license the software to
      third parties as a standalone library or SDK.


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GENERAL TERMS (BOTH TIERS)
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PATENT GRANT

  Each contributor (including Jordan Rowles) hereby grants you a perpetual,
  worldwide, non-exclusive, royalty-free, irrevocable (except as stated in
  this section) patent licence to make, have made, use, offer to sell, sell,
  import, and otherwise transfer the software, where such licence applies
  only to those patent claims licensable by such contributor that are
  necessarily infringed by their contribution alone or in combination with
  the software.

  If you institute patent litigation against any entity (including a
  cross-claim or counterclaim in a lawsuit) alleging that the software or a
  contribution constitutes direct or contributory patent infringement, then
  any patent licences granted to you under this licence terminate as of the
  date such litigation is filed.

CONTRIBUTIONS

  Unless you explicitly state otherwise, any contribution intentionally
  submitted for inclusion in the software by you to Jordan Rowles shall be
  licensed to Jordan Rowles under the terms of this dual licence, without
  any additional terms or conditions. You retain all right, title, and
  interest in your contributions.

TRADEMARKS

  This licence does not grant permission to use the trade names, trademarks,
  service marks, or product names of Jordan Rowles (including "LeanLucene"),
  except as required for reasonable and customary use in describing the
  origin of the software and reproducing the attribution notice.

DISCLAIMER OF WARRANTIES

  THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT. IN NO EVENT
  SHALL JORDAN ROWLES BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY,
  WHETHER IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF,
  OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.

LIMITATION OF LIABILITY

  TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL
  JORDAN ROWLES BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING LOSS OF PROFITS, DATA,
  GOODWILL, OR BUSINESS INTERRUPTION, HOWEVER CAUSED AND ON ANY THEORY OF
  LIABILITY, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

TERMINATION

  Your rights under the applicable licence tier terminate automatically if
  you materially breach its terms and fail to cure the breach within thirty
  (30) days of receiving written notice from Jordan Rowles. Upon termination,
  you must cease all use and distribution of the software and destroy all
  copies in your possession. Termination does not limit Jordan Rowles's
  right to seek other remedies.

GOVERNING LAW

  This Agreement shall be governed by and construed in accordance with the
  laws of England and Wales, without regard to its conflict of law provisions.
  Any disputes arising under this Agreement shall be subject to the exclusive
  jurisdiction of the courts of England and Wales.

ENTIRE AGREEMENT

  This document constitutes the entire agreement between the parties with
  respect to the subject matter herein and supersedes all prior or
  contemporaneous agreements, representations, or understandings. This
  licence may only be modified in writing signed by Jordan Rowles.

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END OF LICENCE
Copyright (c) 2026 Jordan Rowles.
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