Revise LICENSE-EXCEPTION.md for clarity and structure

LICENSE-EXCEPTION.md

@@ -1,52 +1,70 @@
-Additional Permission under AGPLv3 Section 7
+# Additional Permission under AGPLv3 Section 7
 
 Copyright (c) CondationCMS Contributors
 
 CondationCMS is licensed under the GNU Affero General Public License version 3 (AGPLv3).
 
-As an additional permission under Section 7 of the AGPLv3, the copyright holders of CondationCMS grant the following exception:
+This file defines an additional permission under Section 7 of the AGPLv3.
 
-Module and Extension Exception
+---
 
-Modules, plugins, themes, templates, and extensions that interact exclusively with CondationCMS through its public and documented extension APIs are considered independent works and are not subject to the copyleft requirements of the AGPLv3.
+## Module and Extension Exception
 
-Such modules, plugins, themes, templates, and extensions may therefore be distributed under any license, including proprietary and commercial licenses.
+Modules, plugins, themes, templates, and extensions that interact exclusively with CondationCMS through its public and documented extension APIs are considered **independent works** and are not subject to the copyleft requirements of the AGPLv3.
+
+Such modules, plugins, themes, templates, and extensions may therefore be distributed under any license, including proprietary or commercial licenses.
 
 This exception applies only if the extension:
 
 - Uses only the public and documented extension APIs intended for third-party development.
-- Remains separable from the CondationCMS core system.
-- Can be installed or removed without modifying CondationCMS core source files.
+- Remains fully separable from the CondationCMS core system.
+- Can be installed, updated, or removed without modifying CondationCMS core source files.
+
+---
 
-Definition of Public Extension APIs
+## Definition of Public Extension APIs
 
-For the purpose of this exception, “public and documented extension APIs” includes officially documented:
+For the purpose of this exception, “public and documented extension APIs” includes only officially documented extension points intended for third-party development, such as:
 
 - Hooks
 - Events
 - Services
 - Template APIs
 - Plugin APIs
 - Module APIs
-- Extension points
-- Interfaces intended for third-party development
+- Extension interfaces
+- Other documented extension points
 
-Internal classes, undocumented APIs, private implementation details, and core internals are not considered public extension APIs.
+Internal classes, internal services, private APIs, and undocumented implementation details are explicitly excluded.
 
-Modifications to the Core System
+---
 
-This exception does not apply to:
+## Core Modifications and Derivative Works
+
+This exception does **not** apply to any of the following:
 
 - Modifications to CondationCMS core source code
 - Patching or altering core functionality
-- Copying substantial portions of core source code
-- Subclassing or replacing internal core classes not intended as public extension APIs
-- Creating derivative works based on internal core components
+- Copying or reusing substantial portions of core source code
+- Subclassing or replacing internal core classes not intended as public APIs
+- Creating derivative works based on internal implementation details
+
+Any such modifications remain fully subject to the AGPLv3.
+
+---
+
+## Installation Boundary
+
+Extensions covered by this exception must:
+
+- Be installable and runnable without changes to the CondationCMS core codebase
+- Not require modification of core files for integration
+- Interact with the system only through documented extension mechanisms
 
-Any such modifications or derivative works remain subject to the AGPLv3.
+---
 
-No Additional Restrictions
+## No Additional Restrictions
 
-This exception does not limit any rights granted under the AGPLv3. All other parts of CondationCMS remain licensed under the AGPLv3.
+This exception does not limit or modify any rights granted under the AGPLv3 itself. All other parts of CondationCMS remain licensed under the AGPLv3.
 
-For the full license text, see the LICENSE file included with this project.
+For the full license text, see the `LICENSE` file in this repository.