I don't buy any of these "I own my Modules" defenses.
Get over yourself. There is a whole brave new world of
open source development. The days of code based Intellectual
property is slowly diminishing.

That said, if a client has contracted for a project I
would not give them anything until they have paid in full.
In fact, we present the code to the client, as part of
their system information packet at the time of training.
Training doesn't take place until full payment has been
received. This is all explained to them ahead of time.