Two flaws about this (okay, 3):
1. It fails totally in search engines. Do you really want to block Google, Yahoo and MSN? Because anyone who looks for the site in a search engine will totally and utterly fail at finding any content on the site.
2. If somehow just one file could be allowed, then technically the script will show it even with ad blockers (just watch, all it needs is a nice NoScript update or something to allow or block certain scripts...)
3. That will only ever work for programs, and I'm assuming not things like host files or local CSS based changes to the page locally.
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