Wow…. I get the fact that the internet serves the global village and that there are reasons a page should be available to all but the simple question was, what script or code it best used to restrict access from certain countries. That that this string began with an inquiry on how to reduce spam, there are undoubtedly a variety of reasons why restricting access by country may be desirable. While many have been kind enough to share their ethical perspectives, not one solution was provided, other than it must be a server-side solution.
Regardless of motivation, this is a community discussion page and a solution would have been welcome to both the original person posting and others of us who are curious enough to have ended up on this string hoping to gain some perspective.