So now, his name will forever have this tarnish to it.
I don't know that I buy the story, but honestly, guys like this, are not the ones that I worry about, since he actually responded to you.
The real bad guys out there will have no qualms at outright ignoring you from the word go. The only recourse would be DMCAs.
Otherwise, I'd just contact someone, ask them to remove it(after the option of licensing it to them first) and then go on my way. You've got a 50/50 chance of getting something where you'd normally get nothing.
I dunno. This thread was a lot of bravado about rights, infringement, etc.. but in the end, you got lucky to get a response, and that you did is great. But, this at the cost of ruining this guy online forever, and potentially doing harm to POTN. (as this happens more and more, it gets known that POTN is a good place to take out your competition, etc.. since it can't really be validated, etc..)
As I said, I am all for your assertiveness and go-getum attitude - that's awesome. I only question what value it has here on POTN and at what expense.