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So it really depends on the scope of the NDA and it should definitely expire at an appropriate time.
Doh! All this time I hadn't found a way to integrate NDA's with my OS coding- I had never thought of getting them to expire :) Brilliant, so obvious, yet I had never thought of it.
I think that solves a lot of problems people have with NDA's, and yet still allows the good points of an NDA.
Thanks :)
JohnFlux