I have created a pretty simple web tool where the user enters some personal information and receives back a spreadsheet listing the likely consequences of various lifestyle choices. (I am being deliberately vague here.) I believe that a) this is a useful tool, b) there is currently nothing like it on the web, and c) it would be extremely easy for a competent programmer to devise a perfect substitute.
I showed this site recently to a near-stranger who is an executive at a large corporation, and was surprised a few days later to receive an email asking if I'd be interested in selling the site, and if so, how much I want for it. He also requested permission to share the site URL with a selected few of his colleagues, and promised not to share it further without my explicit permission.
I am paralyzed by the "how much do you want for it" question, but that's not something I expect to get help for here. Instead, my question is: Should I (and can I) do anything at this point by way of intellectual property protection. It seems clear to me that if this organization wants a site like mine, their staff can whip one up for them in a few weeks. Is there a way to protect against that?