FCC Rules??

On the bottom of every piece of electronic kit in the U.S. there is a sticker that says the device cannot produce any interferring signal and must accept any other signals received, even if they are harmfu. (that's paraphrasing btw...)

I don't see why picking up a radio signal from an unsecured router wouldn't qualify here. My deivce is accepting a signal from the router isn't it? From the way the sticker reads it seems that I'm actually required by law to accept the signal from that router.