SPDX: document dual license notation

In [1] we discussed how we should deal with dual (or, more generally, multiple) licensed files. Add this to Licenses/README so it's properly documented. [1] http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/166518 Signed-off-by: Wolfgang Denk <[email protected]> [trini: Add the word 'list' to the end of the line, per Stephen Warren's feedback] Signed-off-by: Tom Rini <[email protected]>
lunasleep · Oct 14, 2013 · 17fd36c · 17fd36c
1 parent 4fa7613
commit 17fd36c
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/Licenses/README b/Licenses/README
@@ -37,6 +37,18 @@ replaced by a single line:
 
 	SPDX-License-Identifier:	GPL-2.0+
 
+Ideally, the license terms of all files in the source tree should be
+defined by such License Identifiers; in no case a file can contain
+more than one such License Identifier list.
+
+If a "SPDX-License-Identifier:" line references more than one Unique
+License Identifier, then this means that the respective file can be
+used under the terms of either of these licenses, i. e. with
+
+	SPDX-License-Identifier:	GPL-2.0+	BSD-3-Clause
+
+you can chose between GPL-2.0+ and BSD-3-Clause licensing.
+
 We use the SPDX Unique License Identifiers here; these are available
 at [2].