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Wolfgang Denkeca3aeb2013-06-21 10:22:36 +02001 U-Boot is Free Software. It is copyrighted by Wolfgang Denk and
2many others who contributed code (see the actual source code and the
3git commit messages for details). You can redistribute U-Boot and/or
4modify it under the terms of version 2 of the GNU General Public
5License as published by the Free Software Foundation. Most of it can
6also be distributed, at your option, under any later version of the
7GNU General Public License -- see individual files for exceptions.
8
9 NOTE! This license does *not* cover the so-called "standalone"
10applications that use U-Boot services by means of the jump table
11provided by U-Boot exactly for this purpose - this is merely
12considered normal use of U-Boot, and does *not* fall under the
13heading of "derived work" -- see file Licenses/Exceptions for
14details.
15
16 Also note that the GPL and the other licenses are copyrighted by
17the Free Software Foundation and other organizations, but the
18instance of code that they refer to (the U-Boot source code) is
19copyrighted by me and others who actually wrote it.
20-- Wolfgang Denk
21
22
23Like many other projects, U-Boot has a tradition of including big
24blocks of License headers in all files. This not only blows up the
25source code with mostly redundant information, but also makes it very
26difficult to generate License Clearing Reports. An additional problem
27is that even the same licenses are referred to by a number of
28slightly varying text blocks (full, abbreviated, different
29indentation, line wrapping and/or white space, with obsolete address
30information, ...) which makes automatic processing a nightmare.
31
32To make this easier, such license headers in the source files will be
33replaced with a single line reference to Unique License Identifiers
34as defined by the Linux Foundation's SPDX project [1]. For example,
35in a source file the full "GPL v2.0 or later" header text will be
36replaced by a single line:
37
38 SPDX-License-Identifier: GPL-2.0+
39
Wolfgang Denk17fd36c2013-10-08 21:53:45 +020040Ideally, the license terms of all files in the source tree should be
41defined by such License Identifiers; in no case a file can contain
42more than one such License Identifier list.
43
44If a "SPDX-License-Identifier:" line references more than one Unique
45License Identifier, then this means that the respective file can be
46used under the terms of either of these licenses, i. e. with
47
48 SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
49
Masahiro Yamada4dcd9a62015-04-17 10:20:43 +090050you can choose between GPL-2.0+ and BSD-3-Clause licensing.
Wolfgang Denk17fd36c2013-10-08 21:53:45 +020051
Wolfgang Denkeca3aeb2013-06-21 10:22:36 +020052We use the SPDX Unique License Identifiers here; these are available
53at [2].
54
55[1] http://spdx.org/
56[2] http://spdx.org/licenses/
57
Roger Meier35084762013-07-27 01:12:38 +020058Full name SPDX Identifier OSI Approved File name URI
Wolfgang Denkeca3aeb2013-06-21 10:22:36 +020059=======================================================================================================================================
Roger Meier35084762013-07-27 01:12:38 +020060GNU General Public License v2.0 only GPL-2.0 Y gpl-2.0.txt http://www.gnu.org/licenses/gpl-2.0.txt
61GNU General Public License v2.0 or later GPL-2.0+ Y gpl-2.0.txt http://www.gnu.org/licenses/gpl-2.0.txt
62GNU Library General Public License v2 or later LGPL-2.0+ Y lgpl-2.0.txt http://www.gnu.org/licenses/old-licenses/lgpl-2.0.txt
63GNU Lesser General Public License v2.1 or later LGPL-2.1+ Y lgpl-2.1.txt http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
64eCos license version 2.0 eCos-2.0 eCos-2.0.txt http://www.gnu.org/licenses/ecos-license.html
Wolfgang Denkcb3761e2013-07-28 22:12:47 +020065BSD 2-Clause License BSD-2-Clause Y bsd-2-clause.txt http://spdx.org/licenses/BSD-2-Clause
66BSD 3-clause "New" or "Revised" License BSD-3-Clause Y bsd-3-clause.txt http://spdx.org/licenses/BSD-3-Clause#licenseText
Wolfgang Denk1b387ef2013-09-17 11:24:06 +020067IBM PIBS (PowerPC Initialization and IBM-pibs ibm-pibs.txt
Wolfgang Denk46263f22013-07-28 22:12:45 +020068 Boot Software) license
Masahiro Yamadac25a1782014-09-01 19:57:36 +090069ISC License ISC Y isc.txt https://spdx.org/licenses/ISC
Simon Glass0f4d2f82016-01-14 18:10:47 -070070SIL OPEN FONT LICENSE (OFL-1.1) OFL-1.1 Y OFL.txt https://spdx.org/licenses/OFL-1.1.html
Masahiro Yamada40a39e82015-04-21 13:39:27 +090071X11 License X11 x11.txt https://spdx.org/licenses/X11.html