BLOCKSTATE SOURCE-AVAILABLE & COMMERCIAL DUAL LICENCE
Version 1.0 (October 2026)

Copyright (c) 2026 James Tyas and Blockstate Contributors. All Rights Reserved.
PATENT NOTICE: This software and its underlying architecture are the subject of a
pending United Kingdom Patent Application ("Process execution control system",
filed 28 October 2026). See PATENTS.md for statutory patent notice details under
Section 62(1) of the United Kingdom Patents Act 1977.

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OVERVIEW OF DUAL-LICENSING MODEL
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Blockstate ("the Software") is distributed under a dual-licensing model designed
to support open inspection, developer prototyping, academic research, and
community contribution, while requiring a commercial licence for production
commercial deployment:

1. COMMUNITY, DEVELOPMENT & EVALUATION TIER (FREE):
   You may view, download, modify, execute, and test the Software free of charge
   solely for Non-Commercial Use, Academic Research, Local Development,
   Automated CI/CD Verification (`blockstate verify`), and Time-Bounded Internal
   Evaluation/Prototyping (see Section 1).

2. COMMERCIAL PRODUCTION & ENTERPRISE TIER (PAID COMMERCIAL LICENCE):
   Any deployment of the Software in a live commercial production environment,
   regulated customer-facing or internal enterprise workflow, or commercial
   hosted/managed service requires a separate written Commercial Enterprise and
   Patent Licence Agreement (see Section 2).

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TERMS AND CONDITIONS
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1. GRANT OF COMMUNITY, DEVELOPMENT AND EVALUATION LICENCE
Subject to the terms and conditions of this Licence, the Licensor hereby grants
You a non-exclusive, non-transferable, royalty-free, revocable copyright licence
to copy, modify, and execute the Software solely for the following Permitted
Purposes:
  (a) Personal, educational, or academic research use;
  (b) Open-source software integration testing and automated compile-time
      verification (`blockstate verify`) in continuous integration pipelines;
  (c) Local developer prototyping, benchmarking, security auditing, and
      non-production staging evaluation for a period of up to ninety (90) days
      for the purpose of evaluating whether to obtain a Commercial Licence; or
  (d) Community contributions (pull requests, bug fixes, and adapters) submitted
      back to the official upstream repository.

2. RESTRICTIONS ON COMMERCIAL PRODUCTION AND MANAGED SERVICES
Absent a separate written Commercial Enterprise and Patent Licence Agreement
executed with the Licensor, You may NOT:
  (a) Deploy, operate, or execute the Software in a commercial production
      environment processing live customer, financial, insurance, healthcare,
      telecommunications, or enterprise operational transactions;
  (b) Offer, host, or provide the Software (or any derivative work thereof) to
      third parties as a managed service, Software-as-a-Service (SaaS),
      Platform-as-a-Service (PaaS), API gateway, or compliance-as-a-service
      offering;
  (c) Remove, alter, or obscure any copyright notices, licence headers, or the
      statutory patent pending notices contained in `LICENSE` or `PATENTS.md`.

3. EXPLICIT RESERVATION OF PATENT RIGHTS (NO IMPLIED PATENT GRANT)
Unlike the Apache License 2.0, this Licence is a conditional copyright licence
only and DOES NOT GRANT any express or implied licence under any patent or
patent application owned or controlled by the Licensor (including, without
limitation, United Kingdom Patent Application "Process execution control system"
and any international Paris Convention, PCT, EPO, or USPTO counterparts).

A narrow, revocable covenant not to sue under the Licensor's applicable patent
claims applies strictly and exclusively while You are operating within the scope
of the Permitted Purposes in Section 1. Any commercial production use outside
Section 1 without a valid Commercial Enterprise and Patent Licence Agreement is
strictly unauthorised under both copyright and patent law.

4. DEFENSIVE RETALIATION TERMINATION
If You institute patent litigation or administrative invalidity proceedings
against the Licensor or any contributor (including a cross-claim or counterclaim
in a lawsuit) alleging that the Software constitutes direct or contributory
patent infringement, then all licences and covenants granted to You under this
Licence shall terminate automatically as of the date such litigation or
proceeding is filed.

5. DISCLAIMER OF WARRANTY AND LIMITATION OF LIABILITY
THE 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, AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS,
COPYRIGHT HOLDERS, OR PATENT APPLICANTS 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.