"The following hypothetical is a possible way that an
unscrupulous company can bypass the restrictions of the general
public license (GPL). I'd love to hear from anyone that can find a
flaw in the argument."
"Let's assume that Acme software takes a GPL Neural Network
program and starts working on a modified, improved version. Acme
intends to make money from its software."
"Next, new employees of Acme are asked to sign a non-disclosure
agreement (NDA) preventing them from discussing the new program or,
in particular, publishing, redistributing or releasing the work
before the company's embargo release date."
"You can probably see where I'm going with this line of thought,
but allow me to go on."