proprietary definition
Privately owned or controlled. Generally referring to a technology that has been developed by an individual, corporation, or other legal entity that considers the specifications to be a trade secret of value and that retains the exclusive right to exploit it, either for its own use or that of legitimate licensees that pay for the privilege. Proprietary technologies generally are patented, which prevents others from copying or otherwise duplicating them.
Whats the difference between downloading a driver from Dell, or downloading a driver from ASUS? You still have to go to the MB manufacturer to get it.
If you have a NVIDIA or ATI card in your Dell, you can use the drivers from these companies.