[PATCH v3 1/3] LICENSES: Add the CC-BY-4.0 license

From: Thorsten Leemhuis <linux@leemhuis.info>
To: Jonathan Corbet <corbet@lwn.net>
Cc: Randy Dunlap <rdunlap@infradead.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	Christoph Hellwig <hch@lst.de>
Subject: [PATCH v3 1/3] LICENSES: Add the CC-BY-4.0 license
Date: Tue, 24 Nov 2020 09:00:01 +0100	[thread overview]
Message-ID: <c07e51e153f453c83c77a75513ad3d5ec70ef1be.1606137108.git.linux@leemhuis.info> (raw)
In-Reply-To: <cover.1606137108.git.linux@leemhuis.info>

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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 this url, but a 'Creative
Commons' was added before 'Attribution 4.0 International' in the first
line:

https://creativecommons.org/licenses/by/4.0/legalcode.txt

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Christoph Hellwig <hch@lst.de>
---
For context: Patch 2 of this series adds a text to the Documentation/ directory
which (for now) uses "GPL-2.0+ OR CC-BY-4.0", as I want to make it easy and
attractive for others to base their work on it. I'm not strongly attached to
CC-BY-4.0, but it seemed like the best choice: it's designed for such usage and
afaics better than using MIT for text files.

Christoph, I stumbled upon commit 19e6420e4170 ("LICENSES: Remove CC-BY-SA-4.0
license text"), where you wrote:

> Using non-GPL licenses for our documentation is rather problematic, as it can
> directly include other files, which generally are GPLv2 licensed and thus not
> compatible.

Do you think this could be an issue here, too? If so, how? The document I added
doesn't directly include other files; but yes, their title might get tracked in
by sphinx when it's processing the document. Is that something we should worry
about?

Can I prevent this or other licensing troubles somehow in the text that uses it?
Can I for example add a hint near the license tag to the header to prevent
trouble? Maybe something like this: "Make sure to use the plaintext version
straight from the sources in case you want to use this text under CC-BY-4.0, as
processed versions (like the HTML version) of this text will have text in them
that is taken from other files which that are not available under CC-BY-4.0
license"? Or should we declare CC-BY-4.0 only to be useful for dual-licensed
content (like those in LICENSES/dual/)? 

Ciao, Thorsten
---
 LICENSES/preferred/CC-BY-4.0 | 405 +++++++++++++++++++++++++++++++++++
 1 file changed, 405 insertions(+)
 create mode 100644 LICENSES/preferred/CC-BY-4.0

diff --git a/LICENSES/preferred/CC-BY-4.0 b/LICENSES/preferred/CC-BY-4.0
new file mode 100644
index 000000000000..20c39f42d95f
--- /dev/null
+++ b/LICENSES/preferred/CC-BY-4.0
@@ -0,0 +1,405 @@
+Valid-License-Identifier: CC-BY-4.0
+SPDX-URL: https://spdx.org/licenses/CC-BY-4.0
+Usage-Guide:
+  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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-- 
2.28.0

