Here is what Wiki says about VCRPlus:
http://en.wikipedia.org/wiki/Video_r...cheduling_code
According to this, it would still work if they published the numbers, since it does not depend on data in the signal.
The automatic time setting code, however, was data included in the vertical blanking interval of the analog signal. Since it is not in the digital signal, it does not get put into the vertical interval of the analog signal that is created from the digital signal in your set top box.