Mobile digital signage solution?

I'm not really sure what a mobile digital signage solution is exactly, but according to KioskMarketplace, "SRN, a provider of datacasting services, has unveiled its Digital Signage Wireless Delivery platform, which enables broadcast of multimedia content to mobile display devices. The displays can be installed in taxi cabs, buses, limousines and any other type of large-scale moblie vehicle fleet."

You can read the full article here.