More privacy stuff

Been lecturing about privacy this week - very interesting as it not only forces you to clearly describe what you already implicitly know but also provides a way for you to expand on your knowledge. I think it was Feynman who said that if you can't explain it simply then you don't understand the subject.

I'm still struggling with this, but we now have a case study which fits within this framework...just need to explain in simple terms the diagram below first:

which should give the intial bits of framework in my "theory of privacy"....the above misses out a few things which I haven't been able to formally explain yet. However just getting this far (even if I don't explain the meanings of O and P here) is quite a leap in conceptualisation of the subject. Clearing out and scoping the concepts leads to a better understanding and now I just need to explain it a few times and I think it might just work....