This license is the same as zlib, except that it requires that an acknowledgement be made in the "product documentation". For Fedora, this is our Release notes, so if you have any packages which use this license, you MUST be sure to have the appropriate acknowledgement in the release notes.
This is from NUnit, other packages may have different notices/copyright holders:
Copyright (c) 2002-2007 Charlie Poole Copyright (c) 2002-2004 James W. Newkirk, Michael C. Two, Alexei A. Vorontsov Copyright (c) 2000-2002 Philip A. Craig 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 (see the following) in the product documentation is required. Portions Copyright (c) 2002-2007 Charlie Poole or Copyright (c) 2002-2004 James W. Newkirk, Michael C. Two, Alexei A. Vorontsov or Copyright (c) 2000-2002 Philip A. Craig 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.