I couldn't find any info on this, but Crytek's lua code has some pretty useful little functions that would be a pain to rewrite if using lua in other commercial projects. It's kindof a grey area with a few things to consider.
Using Crytek's Lua code outside of Cryengine
Moderators - Reputation: 14333
Posted 24 September 2013 - 04:24 PM
Crytek's EULA surely contains some guidelines on this. Where did you look for "info on this" if not Crytek's EULA? Just because you say it's a gray area doesn't mean it's really all that gray.
Making games fun and getting them done.
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Moderators - Reputation: 48164
Posted 24 September 2013 - 08:55 PM
Everything (every creative work) is covered by copyright by default. Unless you've been given permission to do this, then it's copyright infringement.
That's black and white. They only grey area is "will I get caught for this"