The copyright says even if it is identical it is a copyright. 1st Speedcubes are adressed as magic cubes. If a stranger picked up a Storebought and a Dayan Zhanchi for an example they could see the differences I have personally tried this at my school. I brought in a Black Zhanchi with Dayan stickers. The first thing someone said is that looks different. They said not a Rubiks cube. It is like the creator of a flat screen TV there are literally millions of flat screen designs but there is no copyright. If they want to copyright a colour scheme they can't copyright all of the blues,yellows,whites,and reds. Like cherry red o light blue not the same colour as a Rubiks brand. The rubiks cube is a magic cube that is for non speed solvers Dayan does not target Walmart or General cubes they go for speed cubers.