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https://github.com/xen-project/xen.git
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Stefano Stabellini
7b068ac890
Remove the extra copy of the GPL license and license copyright headers from CONTRIBUTING and the top-level COPYING. Mention of the LICENSES/ directory and also mention the SPDX tag. SPDX support is still in progress and COPYING files in subdirectories still need to be updated. Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com> Reviewed-by: Julien Grall <jgrall@amazon.com> Release-acked-by: Henry Wang <Henry.Wang@arm.com>
76 lines
2.8 KiB
Plaintext
76 lines
2.8 KiB
Plaintext
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GNU General Public License
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--------------------------
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Most files in this repository are licensed under the terms of the GNU
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General Public License (GPL), a copy of which is present under the
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LICENSES/ directory. Note that the only valid version of the GPL as far
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as the files in this repository are concerned is _this_ particular
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version of the license (i.e., *only* v2, not v2.2 or v3.x or whatever),
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unless explicitly otherwise stated.
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Some code fragments in the hypervisor and associated subsystems
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include other license stanzas: the most common ones are listed in
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the *License Exceptions* section of this file.
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When these code sections are compiled as part of a
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GPLv2-licensed program, such as Xen, the result is licensed under
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GPLv2. See the FSF's definition of GPL compatibility:
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http://www.gnu.org/licenses/gpl-faq.html#WhatDoesCompatMean
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And how this applies to a range of open source licenses:
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http://www.gnu.org/licenses/license-list.html
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A number of files will also specify GPL exceptions, such as
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- Autoconf exception
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- Bison exception
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- GCC exception
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In addition the xen directory also contains a XEN NOTICE clarifying
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what constitutes a derived work, which applies to the xen directory
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and its subdirectories (see xen/COPYING).
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Licensing Exceptions
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--------------------
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For the convenience of users and those who are porting OSes to run as
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Xen guests, certain files in this repository are not subject to the
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GPL when distributed separately or included in software packages
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outside this repository.
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Instead we specify more relaxed licenses, depending on need, such as
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- BSD style license (BSD Original, BSD Modified, Intel BSD)
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- MIT license
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- LGPL 2.1
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Affected files include the Xen interface headers (xen/include/public),
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various drivers, support functions and header files within Xen-aware
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Linux source trees. In all such cases, license terms are stated at the
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top of the file or in a COPYING file in the same directory.
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Sphinx documentation is licensed under CC-BY 4.0. See
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docs/README.source for more specific information.
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In some cases, compatible 3rd party code has been imported into the
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Xen tree, retaining the original license, such as
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- AES-128 3.0
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- FSF Unlimited License
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- Laurikari License
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- Public Domain
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- ZLIB License
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Significant code imports are highlighted in a README.source file
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in the directory into which the file or code snippet was imported.
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Note that *any* file that is modified and then distributed within a
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Linux kernel is still subject to the GNU GPL.
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Contributions
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-------------
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Contributions are governed by the license that applies to the relevant
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specific file or by the license specified in the COPYING file, that
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governs the license of its containing directory and its subdirectories.
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For more information, see the CONTRIBUTING file.
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