License Infrastructure Interest Group

Overview

This group is for discussion of all things having to do with licenses, specifically, license wrangling, field parsing, possible SPDX implementation, etc.

• Contact Eflanagan for more info

SPDX

The Software Package Data Exchange® (SPDX™) specification is a standard format for communicating the components, licenses and copyrights associated with a software package. For the common-licenses used for the Yocto Project, we should, when possible, use the SPDX generic licenses for Yocto's license wrangling. As well, we should also use the SPDX Identifier field to identify the license fields within LICENSE

• http://spdx.org/licenses/ for more info on common-license text and the Identifier field.
• http://spdx.research paper.org/ for more info on SPDX

LICENSE Field Standard

Naming

All names should adhere to the textfile name of the common-license as defined in poky/meta/files/common-licenses. These file names follow the SPDX naming standard when an SPDX license file is available. If no SPDX file exists, we should:

• Attempt to get a generic license from the license provider
• Offer the generic upstream to SPDX (to be defined)

This following is a list of all liceneses currently registered with SPDX.

Licenses

Full name	Identifier	Text
Academic Free License v1.1	AFL-1.1	License Text
Academic Free License v1.2	AFL-1.2	License Text
Academic Free License v2.0	AFL-2.0	License Text
Academic Free License v2.1	AFL-2.1	License Text
Adaptive Public License	APL-1.0	License Text
Apache License 1.0	Apache-1.0	License Text
Apache License 1.1	Apache-1.1	License Text
Apache License 2.0	Apache-2.0	License Text
Apple Public Source License 1.0	APSL-1.0	License Text
Apple Public Source License 1.1	APSL-1.1	License Text
Apple Public Source License 1.2	APSL-1.2	License Text
Apple Public Source License 2.0	APSL-2.0	License Text
Artistic License 1.0	Artistic-1.0	License Text
Artistic License 2.0	Artistic-2.0	License Text
Attribution Assurance License	AAL	License Text
Boost Software License 1.0	BSL-1.0	License Text
BSD 2-clause "Simplified" or "FreeBSD" License	BSD-2-Clause	License Text
BSD 3-clause "New" or "Revised" License	BSD-3-Clause	License Text
BSD 4-clause "Original" or "Old" License	BSD-4-Clause	License Text
CeCILL Free Software License Agreement v1.0	CECILL-1.0	License Text
CeCILL Free Software License Agreement v2.0	CECILL-2.0	License Text
CeCILL-B Free Software License Agreement	CECILL-B	License Text
CeCILL-C Free Software License Agreement	CECILL-C	License Text
Clarified Artistic License	ClArtistic	License Text
Common Development and Distribution License 1.0	CDDL-1.0	License Text
Common Public Attribution License 1.0	CPAL-1.0	License Text
Common Public License 1.0	CPL-1.0	License Text
Computer Associates Trusted Open Source License 1.1	CATOSL-1.1	License Text
Creative Commons Attribution 1.0	CC-BY-1.0	License Text
Creative Commons Attribution 2.0	CC-BY-2.0	License Text
Creative Commons Attribution 2.5	CC-BY-2.5	License Text
Creative Commons Attribution 3.0	CC-BY-3.0	License Text
Creative Commons Attribution No Derivatives 1.0	CC-BY-ND-1.0	License Text
Creative Commons Attribution No Derivatives 2.0	CC-BY-ND-2.0	License Text
Creative Commons Attribution No Derivatives 2.5	CC-BY-ND-2.5	License Text
Creative Commons Attribution No Derivatives 3.0	CC-BY-ND-3.0	License Text
Creative Commons Attribution Non Commercial 1.0	CC-BY-NC-1.0	License Text
Creative Commons Attribution Non Commercial 2.0	CC-BY-NC-2.0	License Text
Creative Commons Attribution Non Commercial 2.5	CC-BY-NC-2.5	License Text
Creative Commons Attribution Non Commercial 3.0	CC-BY-NC-3.0	License Text
Creative Commons Attribution Non Commercial No Derivatives 1.0	CC-BY-NC-ND-1.0	License Text
Creative Commons Attribution Non Commercial No Derivatives 2.0	CC-BY-NC-ND-2.0	License Text
Creative Commons Attribution Non Commercial No Derivatives 2.5	CC-BY-NC-ND-2.5	License Text
Creative Commons Attribution Non Commercial No Derivatives 3.0	CC-BY-NC-ND-3.0	License Text
Creative Commons Attribution Non Commercial Share Alike 1.0	CC-BY-NC-SA-1.0	License Text
Creative Commons Attribution Non Commercial Share Alike 2.0	CC-BY-NC-SA-2.0	License Text
Creative Commons Attribution Non Commercial Share Alike 2.5	CC-BY-NC-SA-2.5	License Text
Creative Commons Attribution Non Commercial Share Alike 3.0	CC-BY-NC-SA-3.0	License Text
Creative Commons Attribution Share Alike 1.0	CC-BY-SA-1.0	License Text
Creative Commons Attribution Share Alike 2.0	CC-BY-SA-2.0	License Text
Creative Commons Attribution Share Alike 2.5	CC-BY-SA-2.5	License Text
Creative Commons Attribution Share Alike 3.0	CC-BY-SA-3.0	License Text
CUA Office Public License v1.0	CUA-OPL-1.0	License Text
Eclipse Public License 1.0	EPL-1.0	License Text
eCos license version 2.0	eCos-2.0	License Text
Educational Community License v1.0	ECL-1.0	License Text
Educational Community License v2.0	ECL-2.0	License Text
Eiffel Forum License v1.0	EFL-1.0	License Text
Eiffel Forum License v2.0	EFL-2.0	License Text
Entessa Public License	Entessa	License Text
Erlang Public License v1.1	ErlPL-1.1	License Text
EU DataGrid Software License	EUDatagrid	License Text
European Union Public License 1.0	EUPL-1.0	License Text
European Union Public License 1.1	EUPL-1.1	License Text
Fair License	Fair	License Text
Frameworx Open License 1.0	Frameworx-1.0	License Text
GNU Affero General Public License v3	AGPL-3.0	License Text
GNU Free Documentation License v1.1	GFDL-1.2	License Text
GNU Free Documentation License v1.2	GFDL-1.2	License Text
GNU Free Documentation License v1.3	GFDL-1.3	License Text
GNU General Public License v1.0 only	GPL-1.0	License Text
GNU General Public License v1.0 or later	GPL-1.0	#licenseText License Text
GNU General Public License v2.0 only	GPL-2.0	License Text
GNU General Public License v2.0 or later	GPL-2.0	#licenseText License Text
GNU General Public License v2.0 w/Autoconf exception	GPL-2.0-with-autoconf-exception	License Text
GNU General Public License v2.0 w/Bison exception	GPL-2-with-bison-exception	License Text
GNU General Public License v2.0 w/Classpath exception	GPL-2.0-with-classpath-exception	License Text
GNU General Public License v2.0 w/GCC Runtime Library exception	GPL-2,0-with-GCC-exception	License Text
GNU General Public License v2.0 w/Font exception	GPL-2,0-with-font-exception	License Text
GNU General Public License v3.0 only	GPL-3.0	License Text
GNU General Public License v3.0 or later	GPL-3.0	#licenseText License Text
GNU General Public License v3.0 w/Autoconf exception	GPL-3.0-with-autoconf-exception	License Text
GNU General Public License v3.0 w/GCC Runtime Library exception	GPL-3.0-with-GCC-exception	License Text
GNU Lesser General Public License v2.1 only	LGPL-2.1	License Text
GNU Lesser General Public License v2.1or later	LGPL-2.1	#licenseText License Text
GNU Lesser General Public License v3.0 only	LGPL-3.0	License Text
GNU Lesser General Public License v3.0 or later	LGPL-3.0	#licenseText License Text
GNU Library General Public License v2 only	LGPL-2.0	License Text
GNU Library General Public License v2 or later	LGPL-2.0	#licenseText License Text
gSOAP Public License v1.b	gSOAP-1.3b	License Text
Historic Permission Notice and Disclaimer	HPND	License Text
IBM Public License v1.0	IPL-1.0	License Text
IPA Font License	IPA	License Text
ISC License (Bind, DHCP Server)	ISC	License Text
LaTeX Project Public License v1.0	LPPL-1.0	License Text
LaTeX Project Public License v1.1	LPPL-1.1	License Text
LaTeX Project Public License v1.2	LPPL-1.2	License Text
LaTeX Project Public License v1.3c	LPPL-1.3c	License Text
libpng License	Libpng	License Text
Lucent Public License v1.02 (Plan9)	LPL-1.02	License Text
Microsoft Public License	MS-PL	License Text
Microsoft Reciprocal License	MS-RL	License Text
MirOS Licence	MirOS	License Text
MIT license (also X11)	MIT	License Text
Motosoto License	Motosoto	License Text
Mozilla Public License 1.0	MPL-1.0	License Text
Mozilla Public License 1.1	MPL-1.1	License Text
Multics License	Multics	License Text
NASA Open Source Agreement 1.3	NASA-1.3	License Text
Naumen Public License	Nauman	License Text
Nethack General Public License	NGPL	License Text
Nokia Open Source License	Nokia	License Text
Non-Profit Open Software License 3.0	NPOSL-3.0	License Text
NTP License	NTP	License Text
OCLC Research Public License 2.0	OCLC-2.0	License Text
Open Group Test Suite License	OGTSL	License Text
Open Software License 1.0	OSL-1.0	License Text
Open Software License 2.0	OSL-2.0	License Text
Open Software License 3.0	OSL-3.0	License Text
OpenLDAP Public License v2.8	OLDAP-2.8	License Text
OpenSSL License	OpenSSL	License Text
PHP License v3.0	PHP-3.0	License Text
PostgreSQL License	PostgreSQL	License Text
Python Software Foundation License v2	Python-2.0	License Text
Q Public License 1.0	QPL-1.0	License Text
RealNetworks Public Source License v1.0	RPSL-1.0	License Text
Reciprocal Public License 1.5	RPL-1.5	License Text
Red Hat eCos Public License v1.1	RHeCos-1.1	License Text
Ricoh Source Code Public License	RSCPL	License Text
Ruby License	Ruby	License Text
SIL Open Font License 1.1	OFL-1.1	License Text
Simple Public License 2.0	Simple-2.0	License Text
Sleepycat License	Sleepycat	License Text
SugarCRM Public License v1.1.3	SugarCRM-1.1.3	License Text
Sun Public License	SPL	License Text
Sybase Open Watcom Public License 1.0	Watcom-1.0	License Text
University of Illinois/NCSA Open Source License	NCSA	License Text
Vovida Software License v1.0	VSL-1.0	License Text
W3C Software and Notice License	W3C	License Text
wxWindows Library License	WXwindows	License Text
X.Net License	Xnet	License Text
XFree86 License 1.1	XFree86-1.1	License Text
Yahoo! Public License v1.1	YPL-1.1	License Text
Zimbra Publice License v1.3	Zimbra-1.3	License Text
zlib License	Zlib	License Text
Zope Public License 1.1	ZPL-1.1	License Text
Zope Public License 2.0	ZPL-2.0	License Text
Zope Public License 2.1	ZPL-2.1	License Text

Parsing operations

The LICENSE field is parsed by converting the field to a Python Abstract Syntax Tree. ASTs are internal to the python compiler and are used by python in the generation of python bytecode. We create, from the LICENSE field after attempting to turn it more "pythonesque", an abstract syntax tree via ast.parse. Using an AST Visitor class, we then dump the ast and visit each node of the tree.

What this means is that, since we are using the python compiler components to parse the LICENSE field, it should be syntactically valid python.