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* People will be able to open the website by typing the url on the broswer directly (so no IP ban required).
I wonder if this is possible? Its an urgent requirement, help needed.
Each click from an SE contains a cgi variable http_referer. If your code checks for a http_referer from Google.nl and then you further check for users in Holland based on IP address you could then conditionally show those who match some different content - or no content.
Then again, Google doesn't like you showing their users something different than normal site visitors so you'd risk a penalty or removal altogether (in all countries) when doing this.