The FCC adopted rules for the unlicensed use of "television white spaces" to promote an efficient use of the wireless spectrum that was set aside for television. If you are wondering what "television white spaces" are, think of the wireless spectrum for television incorporating lanes on a highway. Then, when you see a motorcyle splitting the lane, that would be analogous to the use of unlicensed television white spaces.
The new rules will allow new wireless devices to operate in the broadcast television spectrum on a secondary basis, where that spectrum is open. This will allow for the use of new and innovative types of unlicensed devices in the unused spectrum to provide broadband data and other services for consumers and businesses (read: Google).
The interesting part about this rule is that devices that will operate in the unlicensed white space will have to pass FCC scrutiny and testing, i.e., regulation, so they do not interfere with the licensed television spectrum. In effect, you will have regulated devices in an unregulated space. Now, where have you seen that before?