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You almost always don't want your hired professionals doing freehand reproductions (there are exceptions -- a stated goal of the NASA worm was that it should be easy to freehand on NASA property), but you certainly want amateurs reproducing it in the wild. If your logo is so ubiquitous and simple that children draw it in their school books (think Nike, Pepsi, McDonalds, NASA again, etc.) then that's free advertising. This sort of non-sponsored advertising exists on a continuum, and it's usually beneficial to the signified organization.