DRTV generally bypasses traditional retail stores to make a product sale directly with the consumer, but can also be used to drive product sales at retail. DRTV is comprised of three primary marketing subgroups of short form, long form and live home shopping.
Persia/Persian is more or less synonymous with Iran/Iranian. Persia is just the older name whereas Iran is the country's modern name. I think people from Iran call themselves Persian because of Iran's negative image in the west since the 1979 revolution.
Iran is the legal name. Persia, was an ancient kingdom within Iran. Iran came to be known as Persia in the West thanks to classical Greek authors during whose time Persia was the dominant kingdom in Iran. To call all of Iran 'Persia', would be like calling all of Britain 'England'.