124 lines
5.3 KiB
Plaintext
124 lines
5.3 KiB
Plaintext
= COPYING.adoc for the Khronos Group OpenXR projects
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// Copyright (c) 2020-2023, The Khronos Group Inc.
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//
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// SPDX-License-Identifier: CC-BY-4.0
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This document is shared across a number of OpenXR GitHub projects, as the
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set of files in those projects is partially overlapping.
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(There is a single "source of truth" internal Khronos GitLab repo these
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GitHub repositories interact with.)
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== Licenses
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The OpenXR GitHub projects use several licenses.
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In general, we work to maintain compliance with the
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https://reuse.software/spec/[REUSE 3.0 specification] with clear copyright
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holders and license identifier listed for each file, preferably in each
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file.
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Where this is not possible, or e.g. when we are using files unmodified from
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other open-source projects, license data is listed:
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* in an adjacent file of the same name, with the additional extension
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"`.license`"
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* in the repository-wide "`.reuse/dep5`" copyright description
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https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/["DEP5"
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machine-readable copyright data] file.
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The https://github.com/fsfe/reuse-tool["`reuse`" command line tool] can be
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used to create a software bill of materials in SPDX format from this data.
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Note that this tool will typically exclude the generated files, so if the
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BOM is important to you, you may consider using the
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https://github.com/KhronosGroup/OpenXR-SDK[OpenXR-SDK] repository that
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contains the API headers and the loader source with all generated files
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pre-generated.
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The data in/adjacent to each file is the authoritative license and copyright
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data.
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However, for ease of understanding, the following general practices can be
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observed.
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(If in doubt, or if the following summary conflicts with the per-file data,
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the per-file data remains authoritative.)
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* The source files (in asciidoctor and other formats) for the OpenXR
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Specification, reference pages, and supporting documentation are licensed
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under the Creative Commons Attribution 4.0 International License (SPDX
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license identifier "`CC-BY-4.0`").
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* Header files, scripts, programs, XML files, and other tooling used or
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generated as part of the build process is licensed under the Apache
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License, Version 2.0.
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* For compatibility with external developers working in GPLed projects who
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have requested it, the main OpenXR headers, XML registry, and loader
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source are licensed under a dual license with the SPDX license identifier
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"`Apache-2.0 OR MIT`" .
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Relevant files include:
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** "`specification/registry/xr.xml`"
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** "`include/openxr/openxr_platform_defines.h`"
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** The generated OpenXR headers "`openxr.h`", "`openxr_platform.h`", and
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"`openxr_reflection.h`".
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** Source files in "`src/loader/`", and a few files in "`src/common/`".
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** Generated source files used by the loader (including pre-generated in
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OpenXR-SDK): "`common_config.h`", "`xr_generated_loader.cpp`", and
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"`xr_generated_loader.hpp`".
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* There are a few files adopted from other open source projects.
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Such files continue under their original licenses, and appropriately
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annotated in accordance with REUSE.
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* Some generated, transient files produced during the course of building the
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specification, headers, or other targets may not have copyrights.
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These are typically very short asciidoc fragments describing parts of the
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OpenXR API, and are incorporated by reference into specification or
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reference page builds.
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Users outside Khronos who create and post OpenXR Specifications, whether
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modified or not, should use the CC-BY-4.0 license on the output documents
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(HTML, PDF, etc.) they generate.
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== Frequently Asked Questions
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Q: Why are the HTML and PDF Specifications posted on Khronos' website under
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a license which is neither CC-BY-4.0 nor Apache 2.0?
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A: The Specifications posted by Khronos in the OpenXR Registry are licensed
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under the proprietary Khronos Specification License.
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Only these Specifications are Ratified by the Khronos Board of Promoters,
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and therefore they are the only Specifications covered by the Khronos
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Intellectual Property Rights Policy.
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Q: Does Khronos allow the creation and distribution of modified versions of
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the OpenXR Specification, such as translations to other languages?
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A: Yes.
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Such modified Specifications, since they are not created by Khronos, should
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be placed under the CC-BY-4.0 license.
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If you believe your modifications are of general interest, consider
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contributing them back by making a pull request (PR) on the OpenXR-Docs
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project.
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Q: Can I contribute changes to the OpenXR Specification?
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A: Yes, by opening an Issue or Pull Request (PR) on the
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link:https://github.com/KhronosGroup/OpenXR-Docs/[OpenXR-Docs] GitHub
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project.
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You must execute a click-through Contributor License Agreement, which brings
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your changes under the umbrella of the Khronos IP policy.
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Q: Can you change the license on your files so they're compatible with my
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license?
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A: We are using a dual license license on `xr.xml`, the main API headers,
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and the loader source files, to make them compatible with GPL-2.0- and
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LGPL-2.0/2.1-licensed projects.
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This replaces earlier approaches of an MIT-like license on the XML and
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Apache 2.0 on all headers, and allows use of the SPDX license identifier
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"`Apache-2.0 OR MIT`" to denote the license.
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If you *require* this same compatibility for use of other Apache-2.0
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licensed files in our repository, please raise an issue identifying the
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files and we will consider changing those specific files to the dual license
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as well.
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