Security through obscurity (or through litigation)

The DMCA imposes a serious restriction on the freedom of speech. The DMCA makes it illegal to talk about certain security systems. The equivalent law for non-digital protection systems would make it illegal to warn people about a cheap and very weak door lock being installed on their houses because criminals could also use that same information.
-- Niels Ferguson, "Censorship in action: why I don't publish my HDCP results," The Risks Digest, Volume 21: Issue 61

To err is human

You learn from your mistakes, but there are too many mistakes to make them all yourself. That's why we publish. We share our knowledge with others, so that they don't have to repeat the same mistake.
-- Niels Ferguson, "Censorship in action: why I don't publish my HDCP results," The Risks Digest, Volume 21: Issue 61