They sell a system they have a patent on. It drills small holes and implants beads to produce raised dots for braille signage.
This is more attractive than the dots in a routed out groove some rotary machines can produce with a special braille cutter. Most new construction of any size will likely require the more attractive method.
To purchase a license is over $2000 if I remember right and there is a learning curve to getting it right.
Unless you do a lot of signs it is questionable whether it is worth it.
Another problem is that they also wholesale finished signs to the same people you may be trying to sell to such as architects and builders.
I would just sub out the work to accent that you stumble across but wouldn't spend time marketing it. Be sure not to let your customers know where you get them as they can bypass you.
At least if they do bypass you, you won't have a $2000 plus investment in a license and inventory of questionable value.
There was a post awhile back with a real case experience. You might find it by searching for accent.
Philadelphia, PA (Really Bensalem)