(from the comments)

why speed safe? doesn't that seem to be sortof strange with respect to a knife?

Well... yeah... I always thought it was a rather silly name, too... especially after one time, I was cutting the tie-wraps off a light rig on a stage and a flipped open the knife, my other hand in "blade proximity" and the tip of the knife whipped out and sliced the crap out of me... that was an instance of "speed unsafe."