xref: /openbmc/u-boot/Licenses/README (revision 3eceff64)

SPDX-License-Identifier: GPL-2.0

  U-Boot is Free Software.  It is copyrighted by Wolfgang Denk and
many others who contributed code (see the actual source code and the
git commit messages for details).  You can redistribute U-Boot and/or
modify it under the terms of version 2 of the GNU General Public
License as published by the Free Software Foundation.  Most of it can
also be distributed, at your option, under any later version of the
GNU General Public License -- see individual files for exceptions.

  NOTE! This license does *not* cover the so-called "standalone"
applications that use U-Boot services by means of the jump table
provided by U-Boot exactly for this purpose - this is merely
considered normal use of U-Boot, and does *not* fall under the
heading of "derived work" -- see file  Licenses/Exceptions  for
details.

  Also note that the GPL and the other licenses are copyrighted by
the Free Software Foundation and other organizations, but the
instance of code that they refer to (the U-Boot source code) is
copyrighted by me and others who actually wrote it.
-- Wolfgang Denk


Like many other projects, U-Boot has a tradition of including big
blocks of License headers in all files.  This not only blows up the
source code with mostly redundant information, but also makes it very
difficult to generate License Clearing Reports.  An additional problem
is that even the same licenses are referred to by a number of
slightly varying text blocks (full, abbreviated, different
indentation, line wrapping and/or white space, with obsolete address
information, ...) which makes automatic processing a nightmare.

To make this easier, such license headers in the source files will be
replaced with a single line reference to Unique License Identifiers
as defined by the Linux Foundation's SPDX project [1].

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+ OR 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].

License identifier syntax
-------------------------

1. Placement:

   The SPDX license identifier in U-Boot files shall be added at the first
   possible line in a file which can contain a comment.  For the majority
   or files this is the first line, except for scripts which require the
   '#!PATH_TO_INTERPRETER' in the first line.  For those scripts the SPDX
   identifier goes into the second line.

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2. Style:

   The SPDX license identifier is added in form of a comment.  The comment
   style depends on the file type::

      C source:	// SPDX-License-Identifier: <SPDX License Expression>
      C header:	/* SPDX-License-Identifier: <SPDX License Expression> */
      ASM:	/* SPDX-License-Identifier: <SPDX License Expression> */
      scripts:	# SPDX-License-Identifier: <SPDX License Expression>
      .rst:	.. SPDX-License-Identifier: <SPDX License Expression>
      .dts{i}:	// SPDX-License-Identifier: <SPDX License Expression>

   If a specific tool cannot handle the standard comment style, then the
   appropriate comment mechanism which the tool accepts shall be used. This
   is the reason for having the "/\* \*/" style comment in C header
   files. There was build breakage observed with generated .lds files where
   'ld' failed to parse the C++ comment. This has been fixed by now, but
   there are still older assembler tools which cannot handle C++ style
   comments.

|

3. Syntax:

   A <SPDX License Expression> is either an SPDX short form license
   identifier found on the SPDX License List, or the combination of two
   SPDX short form license identifiers separated by "WITH" when a license
   exception applies. When multiple licenses apply, an expression consists
   of keywords "AND", "OR" separating sub-expressions and surrounded by
   "(", ")" .

   License identifiers for licenses like [L]GPL with the 'or later' option
   are constructed by using a "+" for indicating the 'or later' option.::

      // SPDX-License-Identifier: GPL-2.0+
      // SPDX-License-Identifier: LGPL-2.1+

   WITH should be used when there is a modifier to a license needed.
   For example, the linux kernel UAPI files use the expression::

      // SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
      // SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note

   Other examples using WITH exceptions found in the linux kernel are::

      // SPDX-License-Identifier: GPL-2.0 WITH mif-exception
      // SPDX-License-Identifier: GPL-2.0+ WITH GCC-exception-2.0

   Exceptions can only be used with particular License identifiers. The
   valid License identifiers are listed in the tags of the exception text
   file.

   OR should be used if the file is dual licensed and only one license is
   to be selected.  For example, some dtsi files are available under dual
   licenses::

      // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause

   Examples from U-Boot for license expressions in dual licensed files::

      // SPDX-License-Identifier: GPL-2.0 OR MIT
      // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause

   AND should be used if the file has multiple licenses whose terms all
   apply to use the file. For example, if code is inherited from another
   project and permission has been given to put it in U-Boot, but the
   original license terms need to remain in effect::

      // SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) AND MIT

   Another other example where both sets of license terms need to be
   adhered to is::

      // SPDX-License-Identifier: GPL-1.0+ AND LGPL-2.1+

[1] http://spdx.org/
[2] http://spdx.org/licenses/

Full name					SPDX Identifier	OSI Approved	File name		URI
=======================================================================================================================================
GNU General Public License v2.0 only		GPL-2.0		Y		gpl-2.0.txt		http://www.gnu.org/licenses/gpl-2.0.txt
GNU General Public License v2.0 or later	GPL-2.0+	Y		gpl-2.0.txt		http://www.gnu.org/licenses/gpl-2.0.txt
GNU 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
GNU 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
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
	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