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 40Ideally, 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 50you can choose between GPL-2.0+ and BSD-3-Clause licensing. 51 52We 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 58Full name SPDX Identifier OSI Approved File name URI 59======================================================================================================================================= 60GNU 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 65BSD 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 67IBM PIBS (PowerPC Initialization and IBM-pibs ibm-pibs.txt 68 Boot Software) license 69ISC License ISC Y isc.txt https://spdx.org/licenses/ISC 70SIL OPEN FONT LICENSE (OFL-1.1) OFL-1.1 Y OFL.txt https://spdx.org/licenses/OFL-1.1.html 71X11 License X11 x11.txt https://spdx.org/licenses/X11.html 72