LICENSES: Add the CC-BY-4.0 license

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>

1 files changed, 410 insertions, 0 deletions

diff --git a/LICENSES/dual/CC-BY-4.0 b/LICENSES/dual/CC-BY-4.0
new file mode 100644
index 000000000000..45a81b8e4669
--- /dev/null
+++ b/LICENSES/dual/CC-BY-4.0
@@ -0,0 +1,410 @@
+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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