Imagine if anyone could own a monochrome printer, but if you wanted to own a color printer you had to have a license.
Or, if you wanted to own an ink-jet printer, there would be no restriction, but you had to have a permit for a laser printer.
I'm just tossing that out here. How about paper versus plastic?
Well we don't rent pigs and I figure it's better to say it right out front because a man that does like to rent pigs is... he's hard to stop - Gus McCrae