Well in this case i bet the copyright belongs to the staffing company's client. Maybe this is work for hire!

But best thing, if copyright is an issue: is to agree on ownership up front. Best to be open about ones intentions:)

>If you work with big companies, they behaive like investors. They invest in their own software. They didn't accept ready made solution. I think this is the case in the question. Contractor work like outsourcing organization.
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>>Clients are usually intrested in what the software will do for their operation. Clients are paying for a service, not investing in a software company.