Hello again :)
I've read from the F.A.Q. that for the BPS to work properly, it is critical to activate it exclusively on the Primary Site.
The plugin has to be avoided on Secondary Sites.
But the only method I know to hide a plugin to Secondary Site, is to network activate the plugin. Therefore activating it for all sites. And that would bring to an illicit configuration of BPS.
So I thought, in order to avoid an harmful activation on a Secondary Site, would be great to hide BulletProof Security before hand from the list of the available plugins?