Even in a democracy, it is necessary to restrict the dissemination of advanced technological knowledge that is of commercial or national-security value  Dissemination to certain countries, those that are or will be competitors or enemies, should be selectively prohibited
There must, however, be free exchange of scientific information
In a democracy, it is not necessary that the public have detailed knowledge of the country's advanced technology in order, for example, to make informed decisions about the direction public policy should take.