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COPYING File for the KhronosGroup/Vulkan-Docs Project

Licenses

The Vulkan-Docs project uses several licenses.

  • The source files (in asciidoctor and other formats) for the Vulkan Specification, reference pages, and supporting documentation are licensed under the Creative Commons Attribution 4.0 International License (SPDX license identifier “CC-BY-4.0”).

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

  • For compatibility with external developers working in GPLed projects who have requested it, vk.xml and video.xml are licensed under a dual (SPDX license identifier “Apache-2.0 OR MIT” License).

  • Fonts derived from the M+ Font Project, found in config/fonts/ are licensed under the M+ Font License (SPDX license identifier “LicenseRef-MPLUS”). This is an open source license but is not OSI-approved, and is found at https://osdn.net/softwaremap/trove_list.php?form_cat=370

  • Code which converts the single-file HTML specification to a chunked HTML document, kept in scripts/asciidoctor-chunker, is licensed under the MIT license. The home of the chunker project is found on GitHub.

  • There are a few remaining files adopted from other open source projects, such as a copy of the KaTeX distribution. Such files continue under their original MIT licenses, or in a few cases, like scripts/htmldiff/htmldiff, had no license statement. We have not added SPDX license identifiers to such externally originated files.

  • 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 Vulkan API, and are incorporated by reference into specification or reference page builds.

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

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 Vulkan 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 Vulkan 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 Vulkan-Docs project.

Q: Can I contribute changes to the Vulkan Specification?

A: Yes, by opening an Issue or Pull Request (PR) on the Vulkan-Docs 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 are compatible with my license?

A: We are using a dual license on vk.xml and video.xml, to make them compatible with GPL-licensed projects such as externally-generated language bindings. This replaces an earlier Apache 2.0 + "Exception Clause" license on the file with a more standard methodology, and allows use of the SPDX license identifier “Apache-2.0 OR MIT” to denote the license.

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