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-rw-r--r--Licenses/README12
1 files changed, 12 insertions, 0 deletions
diff --git a/Licenses/README b/Licenses/README
index 9f611925573..c6ff2774fc9 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 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].