안녕하세요.

	zlib/libpng license가 GPL 계열이긴하지만, GPL 라이선스를 따르라는 것은 아닙니다.

	따라서 zlib/libpng license의 내용에 따라 사용하시면 될 것 같습니다.

	 

	<참고: 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.