The files in, and generated output documents from this Vulkan-Docs project are under a mix of copyright and license statements. Refer to the individual files for specific information. As a general guideline:

• The Vulkan Specification asciidoc sources, as well as other documentation which we expect people may wish to regenerate and distributed in other formats - such as the reference pages generated from the Specification source - are under a Creative Commons Attribution 4.0 license. ** The specification sources have only recently (as of June 2017) been placed under this license. We will now be able to accept pull requests on Github, but there is a related Contribution License Agreement which people proposing PRs to the Vulkan-Docs repository must execute as part of opening the PR.
• Generated output documents, including the official Vulkan Specification PDF and HTML documents, are under a proprietary Khronos license. See https://www.khronos.org/registry/speccopyright.html . Only Specification documents posted in the Vulkan Registry are official.
• The Vulkan headers, spec build tools, and spec and registry configuration files are, for the most part, under the Apache 2 license. Some older files are under BSD-like licenses which may eventually be updated to Apache 2 as we have time.
• There may be some configuration files customized from material shipped with the asciidoc and dblatex distributions. Such files continue under their original copyrights.
• 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.
• If something is missing a copyright statement and that poses an actual problem for whatever you‘re doing, file an issue on GitHub and we’ll eventually correct it in some fashion.

Working with the different Khronos member company IP lawyers to make license changes is a very slow process constrained by the Khronos Member Agreement and IP Policy as well as by individual company concerns about their IP. Do not expect rapid changes in anything having to to with copyrights and licensing.