Switch to Sustainable Use License (fair-code model)

- Replace ISC license with Sustainable Use License v1.0
- Add LICENSE_FAQ.md explaining the fair-code approach
- Update package.json with new license identifier
- Add license headers to main entry point files
- Update README with clear license usage guidelines

Following n8n's licensing approach, this provides:
- Free use for internal business purposes
- Free use for personal/non-commercial projects
- Restrictions on hosting as a service
- Protection against commercial exploitation

No .ee. mechanism implemented yet - all features remain
freely available under the single license.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,49 @@
+Sustainable Use License
+
+Version 1.0
+
+## Acceptance
+
+By using the software, you agree to all of the terms and conditions below.
+
+## Copyright License
+
+The licensor grants you a non-exclusive, royalty-free, worldwide, non-sublicensable, non-transferable license to use, copy, distribute, make available, and prepare derivative works of the software, in each case subject to the limitations below.
+
+## Limitations
+
+You may use or modify the software only for your own internal business purposes or for non-commercial or personal use. You may distribute the software or provide it to others only if you do so free of charge for non-commercial purposes. You may not alter, remove, or obscure any licensing, copyright, or other notices of the licensor in the software. Any use of the licensor's trademarks is subject to applicable law.
+
+## Patents
+
+The licensor grants you a license, under any patent claims the licensor can license, or becomes able to license, to make, have made, use, sell, offer for sale, import and have imported the software, in each case subject to the limitations and conditions in this license. This license does not cover any patent claims that you cause to be infringed by modifications or additions to the software. If you or your company make any written claim that the software infringes or contributes to infringement of any patent, your patent license for the software granted under these terms ends immediately. If your company makes such a claim, your patent license ends immediately for work on behalf of your company.
+
+## Notices
+
+You must ensure that anyone who gets a copy of any part of the software from you also gets a copy of these terms. If you modify the software, you must include in any modified copies of the software a prominent notice stating that you have modified the software.
+
+## No Other Rights
+
+These terms do not imply any licenses other than those expressly granted in these terms.
+
+## Termination
+
+If you use the software in violation of these terms, such use is not licensed, and your license will automatically terminate. If the licensor provides you with a notice of your violation, and you cease all violations of this license no later than 30 days after you receive that notice, your license will be reinstated retroactively. However, if you violate these terms after such reinstatement, any additional violation of these terms will cause your license to terminate automatically and permanently.
+
+## No Liability
+
+As far as the law allows, the software comes as is, without any warranty or condition, and the licensor will not be liable to you for any damages arising out of these terms or the use or nature of the software, under any kind of legal claim.
+
+## Definitions
+
+The "licensor" is the entity offering these terms.
+
+The "software" is the software the licensor makes available under these terms, including any portion of it.
+
+"You" refers to the individual or entity agreeing to these terms.
+
+"Your company" is any legal entity, sole proprietorship, or other kind of organization that you work for, plus all organizations that have control over, are under the control of, or are under common control with that organization. Control means ownership of substantially all the assets of an entity, or the power to direct its management and policies by vote, contract, or otherwise. Control can be direct or indirect.
+
+"Your license" is the license granted to you for the software under these terms.
+
+"Use" means anything you do with the software requiring your license.

LICENSE_FAQ.md

@@ -0,0 +1,59 @@
+# License FAQ
+
+## What is the Sustainable Use License?
+
+The Sustainable Use License is a "fair-code" license that allows free use of the software for internal business purposes and non-commercial use, while restricting commercial redistribution or hosting as a service.
+
+## What can I do with this software?
+
+✅ **You CAN:**
+- Use it for your own internal business purposes
+- Use it for personal, non-commercial projects
+- Modify it for your own use
+- Share it with others for free (non-commercial)
+- Use it to learn and experiment
+- Use it in development and testing environments
+
+❌ **You CANNOT:**
+- Host it as a service for others
+- Sell it or include it in commercial products
+- White-label it for commercial purposes
+- Remove licensing notices
+- Use it in violation of the license terms
+
+## Is this "open source"?
+
+No, this is "fair-code" or "source-available" software. While you can view and modify the source code, there are restrictions on commercial use that make it incompatible with the Open Source Definition.
+
+## Why use this license?
+
+This license helps ensure the project remains sustainable while still providing value to the community. It prevents large cloud providers from offering the software as a service without contributing back, while allowing individuals and businesses to use it freely for their own purposes.
+
+## Can I use this in my company?
+
+Yes! You can use this software for your company's internal business purposes. You just can't resell it or offer it as a service to others.
+
+## What about enterprise features?
+
+Currently, all features are available under the same license. In the future, some enterprise features may be added under a different license model (similar to n8n's .ee. system), but for now everything is included.
+
+## How is this enforced?
+
+The license is primarily enforced through legal means rather than technical restrictions. Using the software in violation of the license terms means you don't have a valid license and could face legal consequences.
+
+## Can I contribute to the project?
+
+Yes! Contributions are welcome. By contributing, you agree that your contributions will be licensed under the same terms.
+
+## What if I need different terms?
+
+For commercial licensing or custom terms, please contact the maintainers through the GitHub repository.
+
+## Comparison with n8n's licensing
+
+This project uses a similar approach to n8n:
+- Same Sustainable Use License for the core functionality
+- Source-available but with commercial restrictions
+- Designed to prevent exploitation while enabling legitimate use
+
+The main difference is that we don't currently have enterprise features (.ee. files) - all functionality is available under the single license.

README.md

@@ -300,8 +300,21 @@ n8n-mcp/
 
 ## License
 
-ISC
+This project is licensed under the [Sustainable Use License](LICENSE).
+
+### What does this mean?
+
+- ✅ **Free to use** for internal business purposes
+- ✅ **Free to use** for personal/non-commercial projects  
+- ✅ **Free to modify** for your own use
+- ✅ **Free to share** with others (non-commercially)
+- ❌ **Cannot** host as a service for others
+- ❌ **Cannot** include in commercial products without permission
+
+This is a "fair-code" license similar to n8n's approach. See [LICENSE_FAQ.md](LICENSE_FAQ.md) for more details.
 
 ## Support
 
-For issues and questions, please use the GitHub issue tracker.
+For issues and questions, please use the GitHub issue tracker.
+
+For commercial licensing inquiries, please open an issue with the "licensing" tag.

package.json

@@ -25,7 +25,7 @@
   },
   "keywords": [],
   "author": "",
-  "license": "ISC",
+  "license": "Sustainable-Use-1.0",
   "bugs": {
     "url": "https://github.com/czlonkowski/n8n-mcp/issues"
   },

src/index-http.ts

@@ -1,4 +1,12 @@
 #!/usr/bin/env node
+/**
+ * n8n Documentation MCP Server
+ * Copyright (c) 2025 n8n-mcp contributors
+ * 
+ * This software is licensed under the Sustainable Use License.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
 import dotenv from 'dotenv';
 import { N8NDocumentationRemoteServer } from './mcp/remote-server';
 import { logger } from './utils/logger';

src/index-v2.ts

@@ -1,3 +1,12 @@
+#!/usr/bin/env node
+/**
+ * n8n Documentation MCP Server
+ * Copyright (c) 2025 n8n-mcp contributors
+ * 
+ * This software is licensed under the Sustainable Use License.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
 import dotenv from 'dotenv';
 import { N8NDocumentationMCPServer } from './mcp/server-v2';
 import { MCPServerConfig } from './types';