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Codex is free for any use (open or closed source, free or commercial software, personal, institutional, etc). You can use it in your projects with no restrictions.
Indication that you use Codex in your project is not required, but would be appreciated.

Source code is provided under the terms of the zlib/png license :

Codex - Coder/Decoder System
Copyright (C) 2010-2011 Gil Costa
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.