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 <w...@denx.de>
---
 Licenses/README | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Licenses/README b/Licenses/README
index 9f61192..6dd7d5b 100644
--- 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.
+
+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].
 
-- 
1.8.3.1

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