Containing information whose unauthorized disclosure could be injurious to either or both parties.

In the context of computer security, it's one of the 4 basic words, next to authenticity, authority and accountability. In the computer security context, it is the principle that keeps information from being disclosed to anyone not authorized to access it.

Y'know, if you log in, you can write something here, or contact authors directly on the site. Create a New User if you don't already have an account.