Hi Mastertech,
It did not take long before the maker of Hitman Pro responded. He states he asked all the producers involved about their formal agreement, and got this.
He became a partner of Webroot and Nod32. Every time the user of Hitman Pro uses the program, he uses their official servers, nothing is changed.
In that respect Hitman Pro 2 on a windows platform does not do anything else than a Firefox or Flock browser does downloading a page (you do not get permission all the time you use the browser, and the use of it is not illegal or unethical for that matter). This seems reasonable, so you can use it., I think.
greets,
polonus