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bill - 5:06 am on May 28, 2008 (gmt 0)
Password protecting the feed would be the easiest way to accomplish that. Simply not providing a feed might be another way. However, that won't stop those "create a feed for sites that don't have them" services. Then you get into blocking services and scrapers. If you want private content put it behind a registration system and moderate who can see it.
Welcome to WebmasterWorld jaklang.