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How free is "free" for cops and robbers?

I have proposed that we shouldn't use nonfree languages to compete in cops-and-robbers challenges, but this proposal needs some demarcation.

Matlab, Stata, LabVIEW all have finite free trials. Batch and AppleScript can only be used on Windows and Mac OS, and it's illegal to emulate TI-BASIC even though it's so easy.

Where do we draw the line of freedom? The point isn't to make a naive one-size-fits-all ruleset but we should have some pillars to stand on. Post one suggestion for each answer so that the suggestions can be voted on individually.