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This logo looked great to me, until I saw the outline!
Out of the three, the bottom one is by far the best. The use of lowercase works really well - simply because all the letters are a uniform size. In the other two, the letters are different cases and therefore different sizes, which to me looks a bit messy.
I love the implementation of the key-hole, it's not at all original I see it everywhere, but this is a logo where it works best!
