Yeah, it's so restricted that they put it right on the front of every keyway they make!

If I had some decent calipers and some restricted keyways to measure, this would make me want to release detailed measurements of as many as I could... Not to give you any ideas, of course!

This BS doesn't increase security, it just pisses off potential customers. I am sure you can probably pick the lock already, and if you are making some special tools, they could be done by trial and error and still get a perfect fit!
(Look at how well impressioning works!)
I don't have any use for the measurements at the moment, but now I want them just because I cannot have them!
Restricted keyway, my @$$! If you want a key, just find a keyblank that is close enough and dremel fit it to the lock. Then cut/file your bitting and you're in business!