The graphic designer, I suppose, though only on their specific implementation of it. Now, for a trivially simple piece like that, and one that has presumably been around long enough that you could hire anybody to draw it for you, I don’t know how you could possibly fail to get an unlimited license(or a full grant of copyright and/or work-for-hire) for $20. Might be a wacky story of prickly religious sensitivities meeting hilarious contracting ineptitude…
