Subject: Re: Possibly stupid GPL question
From: Richard Stallman <rms@gnu.org>
Date: Thu, 30 Sep 1999 19:49:38 -0600 (MDT)

In general, nondisclosure agreements apply to information that is a
trade secret, and they cease to apply to information that becomes
public knowledge.  A released free software program is public
knowledge, so ordinary nondisclosure agreements won't cover it anyway.