License

Nini is distributed under the MIT license, which is similar to the BSD license.
This license means that you can distribute this application and/or the source code with your commercial or non-commercial application for free. You will never have to pay me or anyone to use it :) All you have to do is if you use any of the source code of the application you must add the copyright to the source code file, which is the following #region in the C# file (if you are distributing the binary you do not need to do anything):

#region Copyright
//
// Nini Configuration Project.
// Copyright (C) 2004 Brent R. Matzelle.  All rights reserved.
//
// This software is published under the terms of the MIT X11 license, a copy of 
// which has been included with this distribution in the LICENSE.txt file.
// 
#endregion

This license is compatible with the GNU GPL

Here is a copy of the license. This is the same as you will find in the LICENSE.txt file of the distribution.

Nini Configuration Project.
Copyright (c) 2004 Brent R. Matzelle

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.