lxml is copyright Infrae and distributed under the BSD license (see
doc/licenses/BSD.txt), with the following exceptions:

Some code, such a selftest.py, selftest2.py and
src/lxml/elementpath.pxi are derived from ElementTree and
cElementTree. See doc/licenses/elementtree.txt for the license text.
Newer versions reuse code from CPython's 'xml.etree' implementation,
licensed under the PSF-License v2.
See https://docs.python.org/3/license.html

A copy of difflib is used as part of lxml.html, forked from the CPython
standard library and licensed under the PSF-License v2.
See https://docs.python.org/3/license.html

lxml.cssselect and lxml.html are copyright Ian Bicking and distributed
under the BSD license (see doc/licenses/BSD.txt).

test.py, the test-runner script, is GPL and copyright Shuttleworth
Foundation. See doc/licenses/GPL.txt. It is believed the unchanged
inclusion of test.py to run the unit test suite falls under the
"aggregation" clause of the GPL and thus does not affect the license
of the rest of the package.

The isoschematron implementation uses several XSL and RelaxNG resources:
 * The (XML syntax) RelaxNG schema for schematron, copyright International
   Organization for Standardization (see
   src/lxml/isoschematron/resources/rng/iso-schematron.rng for the license
   text)
 * The skeleton iso-schematron-xlt1 pure-xslt schematron implementation
   xsl stylesheets, copyright Rick Jelliffe and Academia Sinica Computing
   Center, Taiwan (see the xsl files here for the license text:
   src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/)
 * The xsd/rng schema schematron extraction xsl transformations are unlicensed
   and copyright the respective authors as noted (see
   src/lxml/isoschematron/resources/xsl/RNG2Schtrn.xsl and
   src/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl)


Binary wheels
-------------

The officiall distributed binary wheels include bundled versions of the libraries
zlib, iconv, libxml2, libxslt and libexslt.
These libraries are linked, used and distributed under their following
respective licenses:

**zlib**: zlib-license, https://www.zlib.net/zlib_license.html

**iconv**: LGPL 2.1, https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html

**libxml2**: MIT

Except where otherwise noted in the source code (e.g. the files dict.c and
list.c, which are covered by a similar licence but with different Copyright
notices) all the files are:

 Copyright (C) 1998-2012 Daniel Veillard.  All Rights Reserved.
 Copyright (C) The Libxml2 Contributors.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is fur-
nished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

**libxslt**: MIT

 Copyright (C) 2001-2002 Daniel Veillard.  All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is fur-
nished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
DANIEL VEILLARD BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON-
NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of Daniel Veillard shall not
be used in advertising or otherwise to promote the sale, use or other deal-
ings in this Software without prior written authorization from him.

**libexslt**: MIT

 Copyright (C) 2001-2002 Thomas Broyer, Charlie Bozeman and Daniel Veillard.
 All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is fur-
nished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON-
NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the authors shall not
be used in advertising or otherwise to promote the sale, use or other deal-
ings in this Software without prior written authorization from him.
