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This license is used for the zlib library and some other open-source libraries/packages. It is very short and very permissive. It requires you to change the name of modified software and contains a sentence removing liability from the authors of the software.
The zlib/libpng License Copyright (c)
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 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.
Describes the ability to use the software for commercial purposes.
Describes the ability to modify the software and create derivatives.
Describes the ability to distribute original or modified (derivative) works.
Describes the ability for you to grant/extend a license to the software.
Describes the warranty and if the software/license owner can be charged for damages.
Describes whether the original copyright must be retained.
Describes the ability to change software's name if modified/distributed.
Including the full text of license in modified software.
