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LICENSES: Add the CC-BY-4.0 license

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Add the full text of the CC-BY-4.0 license to the kernel tree as well as
the required tags for reference and tooling.

The license text was copied directly from the following url, but for
clarification a 'Creative Commons' was added before 'Attribution 4.0
International' in the first line:
https://creativecommons.org/licenses/by/4.0/legalcode.txt

CC-BY-4.0 is GPLv2 compatible, but when for example used for the
kernel's documentation it can easily happen that sphinx during
processing combines it with text or code from files using a more
restrictive license[1]. This bears pitfalls, hence point that risk out
and suggest to only use this license in combination with the GPLv2.

[1] https://lkml.kernel.org/r/20201201144314.GA14256@lst.de

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/7115b6c20ae3e6db0370fe4002dd586011205e1c.1607063223.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Thorsten Leemhuis 2020-12-04 07:43:48 +01:00 committed by Jonathan Corbet
parent 751d5b2741
commit bc41a7f364
1 changed files with 410 additions and 0 deletions
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Valid-License-Identifier: CC-BY-4.0
SPDX-URL: https://spdx.org/licenses/CC-BY-4.0
Usage-Guide:
Do NOT use this license for code, but it's acceptable for content like artwork
or documentation. When using it for the latter, it's best to use it together
with a GPL2 compatible license using "OR", as CC-BY-4.0 texts processed by
the kernel's build system might combine it with content taken from more
restrictive licenses.
To use the Creative Commons Attribution 4.0 International license put
the following SPDX tag/value pair into a comment according to the
placement guidelines in the licensing rules documentation:
SPDX-License-Identifier: CC-BY-4.0
License-Text:
Creative Commons Attribution 4.0 International
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