Dear jarich and pjf,
I think that the confusion about the issue of restricted data stems from it being a solution to a problem we haven't seen. You should define the cases where this would be neccessary, perhaps with some examples. I, personally, have never encountered a situation such as sensitive data leaking out etc. and so restricted data seems superficial to me.

I am sure that there are others with my opinion and I urge some of the more experienced monks to clearly explain the situations in which we would need restricted data...