Colour copyright allows a company to use a particular combination or shade of colour in its own industry. Other people/companies can still use these colours, granted they are in direct competition with the company that owns the rights to that certain colour. For example, Pepsi would not be able to use the same red that Coca-Cola advertises with.

TIFFANY BLUE:

“Tiffany Blue was first associated with the upscale jeweler in 1845, when Charles Lewis Tiffany chose the robin’s egg shade for the cover of the company’s first catalog, or “Blue Book.” According to the company, he may have selected the color because turquoise was a popular gemstone at the time. Today the color is not only trademarked (it has been since 1998), it also has its own custom Pantone number: 1837, the year the company was founded.”

(http://mentalfloss.com/article/27396/9-trademarked-colors)

CADBURY PURPLE:

“Though royal purple has been associated with Cadbury since they wrapped their confections in the shade to honor Queen Victoria in the 1800s, the company is losing ground in the battle to use Pantone 2685C exclusively. For over a decade, the company has been embroiled in a legal skirmish with Nestle U.K., which seeks to use a similar color. Though Cadbury won the original case in High Court, the ruling was later overturned—and the war rages on.”

(http://mentalfloss.com/article/27396/9-trademarked-colors)