>>I signed an NDA and did some work for a client. The client has
>>backed out of the project, and I feel I'd like to have a go at

It is very difficult to "repudiate" an agreement/contract.  The legal 
fee taught me that the safest way is when the concrete action committed 
by the other party has broken the agreement/contract first.

Search for "repudiate", some of the searches shall guide you in what to 
look for.

Ling SM
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