non-lethal skate sharpening

A few years ago, I was watching a Red Wings game on ESPN, and one of the
commentators mentioned that the Red Wings (and perhaps a few other NHL
teams as well) had developed a new technique to sharpen skate blades
without cutting skin.  It was a certain shape the hollow of the blade was
cut.  It would still enable skating, but the chances of someone getting
seriously injured by an errant skate blade were seriously reduced.

Has anyone else heard about this?  If so, have more (or all) NHL teams
picked up this new skating sharpening technique?  Is this particular skate
sharpening technique more expensive than regular techniques?  How
widespread has this new technique become (i.e., has it filtered down to
the level of house and recreational leagues yet)?