If you can copyright a black rectangle, it would only make sense that you can copyright a color scheme. Seven Towns the owner of the “Rubik’s Cube” brand notified Dayan, the maker of the notable cubes such as the GuHong and Zhanchi, that the color scheme violated Seven Towns’ copyright. That is blue opposite green, white opposite yellow, and red opposite orange. Dayan will be addressing this by changing orange to purple as the default color scheme of their cubes. The only good I see coming out of this is that people who use purple color schemes will be happy, and Cubesmith.com will see a large order increase of only orange stickers.
Source: Speedsolving.com thread