code: @Override
      public IAuthorizationPrincipal[] getAuthorizedPrincipals(String activity, String target)
              throws AuthorizationException {
          return getAuthorizationService().getAuthorizedPrincipals(getOwner(), activity, target);
      }
docs: Returns <code>IAuthorizationPrincipals</code> granted <code>IPermissions</code> by the owner
  of this <code>IPermissionManager</code>, for the given <code>activity</code> and <code>target
  </code>. If either parameter is null, it is ignored.
  
  @return IAuthorizationPrincipal[]
  @param activity String - the Permission activity
  @param target String - the Permission target