> If you wrote this software during your working time (nine to five), and were paid for that time, then the company owns the software.
I don't live in the US, but copyright laws are quite homogeneous world wide. But I do have the impression that copyright is kept as long as it is not signed over.
given that the person did logistics without an employment contract, he could notice the company that he retracts all rights to use the software wrote.
Of cause that would cause havoc to the company, and they could probably counter sue that he did something incurring the liability that he was never asked to.