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COPYING file for the KhronosGroup/glTF project

Licenses

The glTF project uses several licenses.

  • The source markup, schemas, and supporting documentation such as figures and images for the glTF 2.0 Specification are licensed under the Creative Commons Attribution 4.0 International License (SPDX license identifier “CC-BY-4.0”).

  • The source markup, schemas, and and supporting documentation such as figures and images for the glTF 1.0 Specification, as well as for Khronos (KHR) extensions to glTF 1.0 and glTF 2.0, are licensed under the proprietary Khronos Specification Copyright (SPDX license identifier “LicenseRef-KhronosSpecCopyright.txt”).

  • The source markup, schemas, and and supporting documentation such as figures and images for vendor-defined extensions are licensed by the responsible vendors. At present we are unsure on the exact license details for vendor extensions and have tagged them all with a “TBD” status until this is resolved (SPDX license identifier “LicenseRef-TBD.txt”).

  • Makefiles, scripts, and other tooling used or generated as part of the build process are licensed under the Apache License, Version 2.0 (SPDX license identifier “Apache-2.0”).

  • Some generated, transient files produced during the course of building the specification, headers, or other targets may not have copyrights. These are typically very short AsciiDoc fragments describing parts of the glTF 2.0 schema, and are incorporated by reference into specification or reference page builds.

Users outside Khronos who create and post glTF Specifications, whether modified or not, should use the CC-BY-4.0 license on the output documents (HTML, PDF, etc.) they generate.

Frequently Asked Questions

Q: Why are the HTML and PDF Specifications posted on Khronos' website under a license which is neither CC-BY nor Apache-2.0?

A: The Specifications posted by Khronos in the glTF Registry are licensed under the proprietary Khronos Specification License. Only these Specifications are Ratified by the Khronos Board of Promoters, and therefore they are the only Specifications covered by the Khronos Intellectual Property Rights Policy.

Q: Does Khronos allow the creation and distribution of modified versions of the glTF Specification, such as translations to other languages?

A: Yes. Such modified Specifications, since they are not created by Khronos, should be placed under the CC-BY license. If you believe your modifications are of general interest, consider contributing them back by making a pull request (PR) on the glTF project.

Q: Can I contribute changes to the glTF Specification?

A: Yes, by opening an Issue or Pull Request (PR) on the glTF Github project. You must execute a click-through Contributor License Agreement, which brings your changes under the umbrella of the Khronos IP policy.

Q: Can you change the license on your files so they’re compatible with my license?

A: If you require GPL compatibility for use of Apache-2.0 licensed files in our repository, please raise an issue identifying the files and we will consider changing those specific files to a dual Apache 2.0 / MIT license.