Thanks to all users for providing such great feedback and helping to keep this program a top quality product. 

Special thanks to David Horton and Brendan Wholihan for their continuous testing, feedback, and support.


//////////////////////////////////////////////

PDF Functionality is implemented through using the XPDF program. This program is available free of charge and distributed through the GNU license. All appropriate documentation, e.g. license, man pages etc., for XPDF is included in the xpdf sub-folder. An extract from the README appears below:

The Xpdf software and documentation are
copyright 1996-2002 Glyph & Cog, LLC.

Email: derekn@foolabs.com
WWW: http://www.foolabs.com/xpdf/

Many thanks to Derek B. Noonburg (derekn@glyphandcog.com) for providing explicit information on how to include XPDF without violating the GNU license agreement.

/////////////////////////////////////////////

Support for the majority of the compressed/composite formats is courtesy of the 7-zip open source libraries. 7-zip is licensed under the GNU LGPL and as such the 7-zip libraries have been compiled and included in the program distribution without any modifications to the 7-zip source code. Source code for the 7-zip libraries can be found here:
www.7-zip.org

An extract from the 7-Zip FAQ (1 Aug 2006) appears below:

---
Q. Can I use the EXE or DLL files from 7-Zip in a Commercial Application?

A. Yes, but you need to specify in your documentation (1) that you used parts of the 7-Zip program, (2) that 7-Zip is licensed under the GNU LGPL license and (3) link to www.7-zip.org where the source code can be found.
---

Many thanks to Igor Pavlov for confirming that ALL libraries (except the unRAR library) included in 7-zip and not just the LZMA SDK are licensed under the GNU LGPL.



/////////////////////////////////////////////

Internal XML support is provided through TinyXML. An extract from the license agreement appears below:

Permission is granted to anyone to use [TinyXML] 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.

/////////////////////////////////////////////

The internal viewer uses the Scintilla editing component for displaying files. The license agreement is shown below:

http://www.scintilla.org/
License for Scintilla and SciTE

Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>

All Rights Reserved 

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that 
both that copyright notice and this permission notice appear in 
supporting documentation. 

NEIL HODGSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS 
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 
AND FITNESS, IN NO EVENT SHALL NEIL HODGSON BE LIABLE FOR ANY 
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER 
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE 
OR PERFORMANCE OF THIS SOFTWARE. 

/////////////////////////////////////////////

The indexing functionality uses the Lucene++ library, which is dual-licensed under LGPL and Apache license. From their web site:
https://github.com/luceneplusplus/LucenePlusPlus

"Lucene++ is an up to date C++ port of the popular Java Lucene library, a high-performance, full-featured text search engine."

The Apache license can be downloaded here:
https://github.com/luceneplusplus/LucenePlusPlus/blob/master/APACHE.license

/////////////////////////////////////////////

There are several parts of Boost that are used in the program, which has it's own license:
http://www.boost.org/users/license.html

An excerpt from their license:

"Boost Software License - Version 1.0 - August 17th, 2003

Permission is hereby granted, free of charge, to any person or organization
obtaining a copy of the software and accompanying documentation covered by
this license (the "Software") to use, reproduce, display, distribute,
execute, and transmit the Software, and to prepare derivative works of the
Software, and to permit third-parties to whom the Software is furnished to
do so, all subject to the following:

The copyright notices in the Software and this entire statement, including
the above license grant, this restriction and the following disclaimer,
must be included in all copies of the Software, in whole or in part, and
all derivative works of the Software, unless such copies or derivative
works are solely in the form of machine-executable object code generated by
a source language processor.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE."

/////////////////////////////////////////////

OCR functionality is provided using the Tesseract OCR library. The source code is freely available here:
https://github.com/tesseract-ocr/tesseract

An excerpt from the project's page:

The code in this repository is licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.


/////////////////////////////////////////////

SQLite is used to manage several program databases. The source code is available here:
https://www.sqlite.org/index.html

An excerpt from the project's page:

All of the code and documentation in SQLite has been dedicated to the public domain by the authors... Anyone is free to 
copy, modify, publish, use, compile, sell, or distribute the original SQLite code, either in source code form or as a 
compiled binary, for any purpose, commercial or non-commercial, and by any means.

https://www.sqlite.org/copyright.html


/////////////////////////////////////////////

TagLib is a library for reading and editing the meta-data of several popular audio formats. 
https://taglib.org/

TagLib is distributed under the GNU Lesser General Public License (LGPL) and Mozilla Public License (MPL).

The TagLib libraries have been compiled and included in the program distribution without any modifications to the TagLib source code


/////////////////////////////////////////////

LZ4 is used for text compression. The copyright message is shown below:

 *  LZ4 - Fast LZ compression algorithm
 *  Header File
 *  Copyright (C) 2011-2016, Yann Collet.

   BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:

       * Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
       * Redistributions in binary form must reproduce the above
   copyright notice, this list of conditions and the following disclaimer
   in the documentation and/or other materials provided with the
   distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

   You can contact the author at :
    - LZ4 homepage : http://www.lz4.org
    - LZ4 source repository : https://github.com/lz4/lz4
	
	
/////////////////////////////////////////////

PDF Rendering uses some code from UXReader PDF Library. The copyright message is shown below:

UXReader PDF Library for Windows License

Copyright © 2017-2019 Julius Oklamcak. 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 furnished 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, FITNESS 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.


/////////////////////////////////////////////

PDF Rendering uses the PDFium library from Google. The copyright message is shown below:

 Copyright 2014 The PDFium Authors
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:

    * Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
 copyright notice, this list of conditions and the following disclaimer
 in the documentation and/or other materials provided with the
 distribution.
    * Neither the name of Google Inc. nor the names of its
 contributors may be used to endorse or promote products derived from
 this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   
   Apache License
   Version 2.0, January 2004
   https://www.apache.org/licenses/