xref: /openbmc/u-boot/Licenses/README (revision 7b8657e2)
1  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
40We use the SPDX Unique License Identifiers here; these are available
41at [2].
42
43[1] http://spdx.org/
44[2] http://spdx.org/licenses/
45
46Full name					SPDX Identifier	OSI Approved	File name		URI
47=======================================================================================================================================
48GNU General Public License v2.0 only		GPL-2.0		Y		gpl-2.0.txt		http://www.gnu.org/licenses/gpl-2.0.txt
49GNU General Public License v2.0 or later	GPL-2.0+	Y		gpl-2.0.txt		http://www.gnu.org/licenses/gpl-2.0.txt
50GNU 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
51GNU 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
52eCos license version 2.0			eCos-2.0			eCos-2.0.txt		http://www.gnu.org/licenses/ecos-license.html
53BSD 2-Clause License				BSD-2-Clause	Y		bsd-2-clause.txt	http://spdx.org/licenses/BSD-2-Clause
54BSD 3-clause "New" or "Revised" License		BSD-3-Clause	Y		bsd-3-clause.txt	http://spdx.org/licenses/BSD-3-Clause#licenseText
55IBM PIBS (PowerPC Initialization and		ibm-pibs			ibm-pibs.txt
56	Boot Software) license
57