> I would say as long as you don't use any proprietary knowledge
> gained from your client, and go about this as finishing and marketing
> the product you started ten years ago, you will be fine

The vast majority, virtually everything really TBH, of the contribution
to the project was from me. The client, fairly clueless, left me to just
get on with all the design and preparatory work. I gained no
knowledge from the client. That gives me no rights of course. Some
work had been paid for, a chunk has not as yet. Now that the client
has chosen not to go ahead, I'm almost reluctant to bill for that
development work in case it precludes me from taking it over (if and
when)

> Why didn't you commercialize the device 10 years ago when you
> first built one?
> 
> Lack of resources and experience?

Pretty much. As Robert said, marketing is a big step and commitment
and the time just wasn't right. It is now, but of course there's that bit
of paper ....... Which I shall be having a very close look at. I know
of at least one other person that the client discussed the product with
in some detail and that person didn't sign an NDA

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