

Colour palettes are collections of facts. Facts don’t have copyright protection and ability to claim copyright for a collection is pretty tenuous. However, copyright may apply to certain related things.
For example: Suppose you see that someone is selling a Photoshop colour palette for money, and included the entire palette in the store image. In that case, there’s literally nothing, legally speaking, stopping someone from prodding the image with a colour picker a bunch of times. But there would be copyright protection for the Photoshop palette file itself, because that’s a more tangible piece of data.
There are also other kinds of intellectual property laws that apply to colours. Pantone gets away with whatever shenanigans they’re doing because of trademarks.
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