It has to do with advertising, sort of, as in the olympics advertising isn't allowed, and logos of clothing brands.. for example oakley logos on oakley products, can't exceed a certain size limit. Hence they are allowed to have an oakley/spy logo on oakley/spy goggles, but they have to be small. And they can't put a monster/red bull logo on the helmet for example as monster/red bull isn't the maker of the helmet... Hope this clear things up..