Versions #50#53 and #62 obviously incorporate a different icon but also feature some minor stylistic changes (shadows and reflections). #62 also features some additional accents on the icon to make it "pop" a little more.
#62 We like the look of this. Might be a bit too simplistic. Can we try some different colors, maybe? We would like to convey a sense of "fun" within our logo as well.
#78 Incorporates a "filter concept" I have a version of #78 that has the "lock" as the "filter" in place of the square...but I couldn't upload it in time, the contest was over! Thanks for the feedback and your consideration.