1 License

     2 

     3 The CLucene Core Library uses a dual license strategy for the source code. 

     4 These licenses are the GNU Lesser General Public License (LGPL) and the Apache

     5 License (Version 2.0). Users can choose the license they wish to distribute

     6 their software under. This means that you do not need to abide by *both*

     7 licenses, but rather than you can choose the license which most suits your

     8 needs.

     9 

    10 To rephrase this and to make it perfectly clear:

    11 CLucene is distributed under the GNU Lesser General Public License (LGPL) 

    12 	*or*

    13 the Apache License, Version 2.0

    14 

    15 However, we are an open source project, and we encourage users to use the LGPL 

    16 license and participate fully in the free software community. Dual licensing

    17 of the CLucene source code provides open and free access to the technology both

    18 for the GPL community and for other developers or companies that cannot use the

    19 GPL.

    20 

    21 You can freely modify, extend, and improve the CLucene source code. The only

    22 question is whether or not you must provide the source code and contribute

    23 modifications to the community. The GNU and Apache licenses allow different

    24 ranges of flexibility in this regard, but in the end, regardless of the license

    25 used, we highly recommend that you submit any bugs, incompatibilities or

    26 added features.

    27 

    28 Note that this same license does *not* apply to the CLucene Contributions

    29 package. You should read the COPYING file in that directory or package for

    30 more information.