chore: update documentation license to CC BY 4.0

[jp-ayyappan]

Summary

• Update LICENSE file from CC BY-SA 4.0 to CC BY 4.0, removing the ShareAlike requirement
• Update README.md with comprehensive documentation overview and a License Change Notice section
• Add SPDX identifier "license": "CC-BY-4.0" to package.json so GitHub correctly detects the license

License Change Notice

Documentation was previously licensed under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). Effective February 13, 2026, it is now licensed under Creative Commons Attribution 4.0 International (CC BY 4.0), which removes the ShareAlike requirement and allows broader reuse.

Code remains licensed under BSD 3-Clause (unchanged).

Test plan

• Verify GitHub displays "CC-BY-4.0" in the repository license tab
• Confirm footer displays correct license info (handled in separate PR feat(docs): Enhance OpenAPI docs and update homepage #184)

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @jp-ayyappan, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on updating the licensing terms for the project's documentation, transitioning to a more permissive Creative Commons license. Concurrently, the project's main README.md file has been thoroughly revised to provide a clearer, more detailed introduction to the documentation, its purpose, and how to contribute, alongside explicitly communicating the license change. These changes aim to improve clarity, encourage broader adoption, and streamline development workflows.

Highlights

• Documentation License Update: The documentation license has been updated from Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) to Creative Commons Attribution 4.0 International (CC BY 4.0), removing the 'ShareAlike' requirement for broader reuse.
• README.md Enhancements: The README.md file has been significantly expanded to include a comprehensive overview of the OpenTDF documentation, its structure, contribution guidelines, quick links, and a detailed 'License Change Notice'.
• SPDX License Identifier: An SPDX license identifier ("license": "CC-BY-4.0") has been added to package.json to ensure GitHub correctly detects the updated license.

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Changelog

• LICENSE
  • Updated the copyright year from 2025 to 2026.
  • Changed the license from Creative Commons Attribution-ShareAlike 4.0 International to Creative Commons Attribution 4.0 International.
  • Removed all clauses and definitions related to the 'ShareAlike' requirement from the license text.
• README.md
  • Added new sections for 'OpenTDF Documentation' overview, 'About This Repository', 'What is OpenTDF?', 'Documentation Structure', 'Contributing', and 'Quick Links'.
  • Revised the 'Local Development' section to include detailed prerequisites for Node.js installation (nvm and direct installation options) and updated installation steps.
  • Removed the 'Preview Deployment' section which detailed deployment to Surge.
  • Introduced a new 'Testing with Feature Branches' section, explaining how to use environment variables to test content from upstream repositories' feature branches.
  • Added a dedicated 'License' section with a 'License Change Notice' explaining the transition from CC BY-SA 4.0 to CC BY 4.0, its implications, and rationale.
• package.json
  • Added a new 'license' field with the value 'CC-BY-4.0' to specify the documentation's license.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request updates the documentation license from CC BY-SA 4.0 to CC BY 4.0. The changes include updating the LICENSE file, adding the SPDX identifier to package.json, and overhauling the README.md with more comprehensive information and a notice about the license change. The changes are mostly good, but I have a few points of feedback on the README.md. The license change notice is confusing due to a future effective date, which creates a logical contradiction. An example in the documentation uses a specific branch name instead of a generic placeholder, which could be confusing. Also, a useful section about preview deployments has been removed. Details and suggestions are in the comments.

[jp-ayyappan]

/gemini review

[gemini-code-assist]

Code Review

This pull request updates the documentation license from CC BY-SA 4.0 to CC BY 4.0, which is reflected in the LICENSE file, README.md, and package.json. The README.md has also been significantly improved with more comprehensive information for developers. However, there is a critical issue with the effective date of the license change. The date is set to 2026, which is in the future, while the license files are being updated now. This creates a legal contradiction and must be addressed.