No, I think this device is very "anti-PRISM". PRISM means that the (US) government can ask MicroSoft/Google/Apple for your files stored in the cloud without a

No, I think this device is very "anti-PRISM". PRISM means that the (US) government can ask MicroSoft/Google/Apple for your files stored in the cloud without a warrant. So you get no protection against "unreasonable searches" specified in the 4th amendment. This drive is controlled by you and stored in your house (with no key stored in the cloud). So the 4th amendment applies, and the government can't just look at your files any time it wants.