License

The CLucene code is split into two sections for licensing reasons. The 'Core'
is strictly dual licensed Apache 2 and LGPL. The CLucene Contributions code
could not be licensed under Apache because of the subcomponents it uses.

CLUCENE CORE:

The CLucene Core Library uses a dual license strategy for the source code. 
These licenses are the GNU Lesser General Public License (LGPL) and the Apache
License (Version 2.0). Users can choose the license they wish to distribute
their software under. This means that you do not need to abide by *both*
licenses, but rather than you can choose the license which most suits your
needs.

For details of these licenses see APACHE.license and LGPL.license in the root
of the source distribution.

Some components of CLucene Core use other licenses. See the CLUCENE CORE SUBCOMPONENTS
section for details. We understand that these licenses are compatible with LGPL and/or
Apache v2, but please consult with a lawyer to be certain of this.

To rephrase the licensing and to make it perfectly clear:
CLucene is distributed under the GNU Lesser General Public License (LGPL) 
	*or*
the Apache License, Version 2.0

However, we are an open source project, and we encourage users to participate fully 
in the free software community by contributing their code back to the project. 
Dual licensing of the CLucene source code provides open and free access to the 
technology both for the GPL community and for other developers or companies 
that cannot use the GPL license.

You can freely modify, extend, and improve the CLucene source code. The only
question is whether or not you must provide the source code and contribute
modifications to the community. The GNU and Apache licenses allow different
ranges of flexibility in this regard, but in the end, regardless of the license
used, we highly recommend that you submit any bugs, incompatibilities or
added features.

Note that this same license does *not* apply to the CLucene Contributions
package. You should read the COPYING file in that directory or package for
more information.


CLUCENE CORE SUBCOMPONENTS: 

CLucene includes a number of subcomponents with separate copyright 
notices and license terms. Your use of the source code for the 
these subcomponents is subject to the terms and conditions of the 
following licenses. 

For the  src\CLucene\util\MD5Digester.cpp component:
/*
 * This is work is derived from material Copyright RSA Data Security, Inc.
 *
 * The RSA copyright statement and Licence for that original material is
 * included below. This is followed by the Apache copyright statement and
 * licence for the modifications made to that material.
 */
/* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
   rights reserved.

   License to copy and use this software is granted provided that it
   is identified as the "RSA Data Security, Inc. MD5 Message-Digest
   Algorithm" in all material mentioning or referencing this software
   or this function.

   License is also granted to make and use derivative works provided
   that such works are identified as "derived from the RSA Data
   Security, Inc. MD5 Message-Digest Algorithm" in all material
   mentioning or referencing the derived work.

   RSA Data Security, Inc. makes no representations concerning either
   the merchantability of this software or the suitability of this
   software for any particular purpose. It is provided "as is"
   without express or implied warranty of any kind.

   These notices must be retained in any copies of any part of this
   documentation and/or software.
 */
 


the cmake/MacroCheckGccVisibility.cmake and MacroEnsureVersion.cmake components:
#
# Copyright (c) 2006, Alexander Neundorf <neundorf@kde.org>
# Copyright (c) 2006, Laurent Montel, <montel@kde.org>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.

the src/core/util/Compress.cpp component:
/* zlib.h -- interface of the 'zlib' general purpose compression library
 version 1.2.3, July 18th, 2005

 Copyright (C) 1995-2005 Jean-loup Gailly and Mark Adler

 This software is provided 'as-is', without any express or implied
 warranty.  In no event will the authors be held liable for any damages
 arising from the use of this software.

 Permission is granted to anyone to use this software for any purpose,
 including commercial applications, and to alter it and redistribute it
 freely, subject to the following restrictions:

 1. The origin of this software must not be misrepresented; you must not
    claim that you wrote the original software. If you use this software
    in a product, an acknowledgment in the product documentation would be
    appreciated but is not required.
 2. Altered source versions must be plainly marked as such, and must not be
    misrepresented as being the original software.
 3. This notice may not be removed or altered from any source distribution.

 Jean-loup Gailly jloup@gzip.org
 Mark Adler madler@alumni.caltech.edu

*/



CLUCENE CONTRIBUTIONS CODE:

PorterStemmer code: couldn't find license. This component is deprecated and will be removed very soon.

Snowball code: needs to be researched.