Digital tv via cable?

Hi
We have 7 analog tv's and just recently upgraded to digital on one, with a set top box,
The cable mounting entrance hookup has like 8 or 9 spots to run feeds from to these other locations.
If i bought a tv that has a "digital tuner in it", will i automatically get digital on that set or does the cable company have to authorize or flip a switch for another set to get digital programming?
I see contradicting statements on set top boxes, digital tuner tvs, and the cable companies.
I know you can split the analogs, but am not aware of the cable stus on digital?
thanks