The zlib/libpng License Copyright (c) <year> <copyright holders>

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.

