It seems to me that the company is confused here. This sounds like a
question of intellectual property, not disclosure. If you signed a
contract with them which said that the IP was theirs then it is,
irrespective of NDAs. If the contract said the IP was yours they don't
have a leg to stand on. If no contract was signed or if IP was
unstated in the contract then it depends on your local laws. In my
state (Victoria, Australia) the IP would belong to me as a contractor
but in other places the situation is different.

If the IP laws end up in your favor then all the NDA is stopping you
from doing is disclosing specifics about the company to a third party.
IP is a whole other thing.

Cheers,
Zik
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