It appears that Stephen Gass is attempting to extort revenues.
> Here in the States the argument over licensing the SawStop technology has been hot, heavy, and plenty of it. Mr. Gass wants 8% for a license, which will add about $80USD to the cost of the typical table saw, plus the cost of the mechanism and the labour to install it. Delta, et al. balked at the price.
http://www.woodworkforums.com/showthread.php?t=60686&pag...
Woodworkers are pretty smart and safety conscious. I've taken a couple wood working classes at my local community college. As our teacher, a master woodworker, told us - "woodworking is about problem solving. it doesn't matter how you do it - there is no right or wrong - only smarter, faster, and safer. it doesn't matter how you do it, as long as it looks nice"