You can't stop knowlege; you shouldn't try. If you do, half the time it's the wrong people that get it first.
— Oathbreakers (Valdemar: Vows and Honor, #2) by Mercedes Lackey (Page 422)
(Page 422 in the omnibus; should be page 179 in the standalone edition. At the end of Chapter 11).
Mercedes Lackey describing the concept of "security by full disclosure" vs "security by obscurity", in 1989 ... before it became popular in computer science.