confidentiality concept !!!

Hi,

I have one problem with confidentiality concept.

Confidentiality concept can retrieves in dependability and security
domain (also in privacy domain), but i don't see the difference. I am
sure that it exist an difference, but i don't to retrieve an document
that explain or provide an definition that will permit to see the
subtile details of that concept.

In summary, What is the difference between (Security -
confidentiality) and (Dependability - confidentiality) ?