The ClanLib license used by 0.8.0 and newer:

ClanLib SDK Copyright (c) 1997-2016 The ClanLib Team 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. Note: Some of the libraries ClanLib may link to may have additional requirements or restrictions.

The note at the end refers to the libraries that ClanLib may use. The ClanLib license only applies to the ClanLib source code itself; each of the dependency libraries used by your project has a license as well, which must be respected. For example, the libvorbis license must be respected if you use clanVorbis.

Earlier versions of ClanLib used the GNU Lesser General Public License.