Azuki project uses Spart library with little customization.
Spart is a parser generator library developed by Jonathan de Halleux
and its license is shown below:

===============================================================================
Spart License (zlib/png)


Copyright (c) 2003 Jonathan de Halleux

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.

Author: Jonathan de Halleux
===============================================================================
