Associated hardware products

We’re developing a special type of (hardware) mouse for CAD modeling. Something like this:

http://www.3dconnexion.com/products/spacenavigator.html

We’d like to build some of the demos that take advantage of the mouse’s functionality using UE4. (The demos are free and would just be packaged with the mouse.) Do we need to pay a 5% royalty on the hardware mouse that we’re selling?

Thanks!

As you’ve described it, no royalties would be owed on those free demos.