I think the key here would also involve the branding of the billboard: most boards have the board owner's branding along the bottom, be it CBS, ClearChannel, or

I think the key here would also involve the branding of the billboard: most boards have the board owner's branding along the bottom, be it CBS, ClearChannel, or one of the regional players. I can't imagine the board owners would be OK with having their brand listed next to board content they didn't clear or control.