You should really use multiple types of blur, as a challenge to myself I've managed to remove the blurring effects in less than 5 mins. Just a tip, good luck selling
well ya know, if I can do it anyone with photoshop can only one i've found as of yet to be uncrackable is uniform noise > lens blur > motion blur > uniform noise > gauss blur Probably not 100% uncrackable but I didn't manage it in half hour of trying