Clarification on Lua's license.

[Lorenzo Donati <lorenzodonatibz@...>]

Hi all!

I'm planning to produce a simple freeware (not open source - for various 
reasons) based on Lua and I need some help to interpret the license 
correctly (I'm not going to make any money out of it and I cannot afford 
any legal expertise) in order to give due credit to Lua team.

The software should comprise a slightly modified Lua interpreter 
(lua.exe + lua51.dll) with some (bytecode-compiled) libraries and 
scripts containing the 'business logic' of the software. The user will 
be using that modified interpreter to interact with the software.

Is it sufficient to add (maybe somewhere in the file with my freeware 
license) the following notice?

"This software is based on Lua language and interpreter.
Lua is Copyright (C) 1994-2008 Lua.org, PUC-Rio.
See http://www.lua.org for more information about Lua."

Or must I include the whole 'COPYRIGHT' file found in Lua's source 
distribution? The problem with this latter approach for me would be that 
 it would seem that the whole software is under MIT software (as far as 
I'm understanding English 'legalese').


Any help or pointer would be appreciated!

-- Lorenzo