MoD 'How to stop leaks' guide leaks
Found on The Register on Sunday, 04 October 2009

A Ministry of Defence guide to preventing information leaking into the public domain has leaked into the public domain.
The Defence Manual of Security was issued in October 2001 and is marked "Restricted". The three volumes, which appear in their entirety on Wikileaks, cover: protective security, personnel security and IT security.
Those books aren't as effective as the author thought they would be.