Does Membership act like this?

Hi all,

Does Membership act like this:

Let's say A, B, C, are categories with C being protected by Membership.

Post 1 is in categories A and B. Not protected quite clearly.
Post 2 is in category C. Protected quite clearly.
Post 3 is in categories A and C. Is it protected? I think it is, because C is protected by Membership.

Let me know if I'm wrong on that last point. It's crucial to know this for Leet News Network.

Nathan