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 choose between GPL-2.0+ and BSD-3-Clause licensing.
+
We use the SPDX Unique License Identifiers here; these are available
at [2].
eCos license version 2.0 eCos-2.0 eCos-2.0.txt http://www.gnu.org/licenses/ecos-license.html
BSD 2-Clause License BSD-2-Clause Y bsd-2-clause.txt http://spdx.org/licenses/BSD-2-Clause
BSD 3-clause "New" or "Revised" License BSD-3-Clause Y bsd-3-clause.txt http://spdx.org/licenses/BSD-3-Clause#licenseText
-IBM PIBS (PowerPC Initialization and ibm-pibs ibm-pibs.txt
+IBM PIBS (PowerPC Initialization and IBM-pibs ibm-pibs.txt
Boot Software) license
+ISC License ISC Y isc.txt https://spdx.org/licenses/ISC
+SIL OPEN FONT LICENSE (OFL-1.1) OFL-1.1 Y OFL.txt https://spdx.org/licenses/OFL-1.1.html
+X11 License X11 x11.txt https://spdx.org/licenses/X11.html