Software Copyright

Hi, I'm looking for some advice on software copyright.

Background:

I had an idea for a software utility to convert data from one program into a another program for the purposes of organizational clarity. I brought this idea to a programmer who happens to work in the very industry that this software utility would be used, so he immediately sees the application and is enthusiastically developing the prototype. I'm meeting with two senior professionals soon to show them the prototype. These two have always liked my idea and have expressed in interest in using it in their companies, to help them in their own jobs. One of these companies is a major, global company.

Question:

What steps should I be taking to protect my intellectual property?

• I'm in the common situation where I don't have the resources to fight a copyright infringement anyway

• is a NDA any good in the case of software?

• the programmer probably owns the copyright now, as one can't copyright an idea, I suppose.

Any feedback from your experiences would be appreciated.