How to design universe to dynamically/conditionally hide sensitive data

Hi,

I am completely new to the BusinessObjects suite and am trying to understand which features might help me solve a problem.

In K-12 education, there is often a desire to allow users to drill into and filter data in various ways, but at the same time a need to protect student confidentiality (as required by FERPA, a U.S. law).  It is not sufficient to prevent access to the most detailed data; we also have to prevent the viewer from inferring sensitive data based on obvious demographic characteristics or already-known data.   For instance, given the following dataset for a school:

Name          Gender          Ethnicity      Score

Bobby          M                 White          B

Samuel         M                Black          A

Richard          M                Black         A

Jenny          F               White               A

Margo          F               Black               A

Whitney        F               White               A

And a data display like this:

                         Ethnicity

Gender               <count of As>

If I filter Gender to F and allow all ethnicity values, I will see the following:

                         Ethnicity: All

Gender:F               3

Assuming I the viewer know there are three females in the dataset, and I happen to know that Jenny attends that school (info which is readily available), I now know that Jenny got an A. 

Can I customize the universe or some other component in the system so that, in the above scenario, I see a "data not available" or something instead of the 3?

thanks!

Martin