I don't believe that anyone can copyright a colour palette legally, not even on moral grounds. You can copyright the specific arrangement of those colours, in those specific widths and positions, but the colours themselves are as free as the oxygen we breathe. (Some companies once tried to put a tax on oxygen. They failed but they're still trying. Go figure.) Use the colours of my palettes - and any other palette you come across for that matter - as much as you want. As fantastic, genius, beautiful, or great they may be, they are all colours that are not "owned" by anyone.