So what happens with closed-source law? [closed]

Question

Lets say Alice Co. writes a program, and Bob Co. hires a contractor to copy it, and put it on their platform?

What is the general legal recourse in these cases? I say general, because most of us are programmers, not lawyers, and we all understand we're not asking for qualified legal advice.

But generally.

What happens? Do you take them to court? What considerations should be taken? What gives you ground to stand on, and others nothing to stand on?