Qt 5.8 | Qt Help | Clucene Core Library

Qt 5.8.0 Reference Documentation

# Clucene Core Library

CLucene is a C++ port of Lucene. It is a high-performance, full- featured text search engine written in C++. CLucene is faster than lucene as it is written in C++.

Used in the Qt Help module and in Qt Assistant.

The sources can be found in qttools-opensource-src-5.8.0/src/assistant/3rdparty/clucene.

Project Homepage

      Copyright (C) 1991, 1999 Free Software Foundation, Inc.
      Copyright (C) 1999 Tom Tromey
      Copyright (C) 2000 Red Hat, Inc.
      Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team
      Copyright (C) 2003-2006 Jos van den Oever
      Copyright (C) 2003-2006 Matt J. Weinstein
      Copyright (C) 2003-2006 The Apache Software Foundation
      Copyright (C) 2006 Jos van den Oever <jos@vandenoever.info>
      Copyright (C) 2015 The Qt Company Ltd.

GNU Lesser General Public License v2.1 only or Apache License, Version 2.0.

      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.

      To rephrase this 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 use the LGPL
      license and participate fully in the free software community. 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.

      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.

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