http://www.sciencemag.org/content/vol298/issue5598/news-summaries.shtml
Martin Enserink
There is a rapidly growing category of information that the government wants to keep under wraps, even though, for one reason or another, it can't be classified. Scientific organizations are concerned about this "sensitive but unclassified" label, however, not only because it increases the administrative burden, but also because it crimps the free flow of scientific information. Its inherent murkiness can lead to arbitrary decisions and abuse, experts say.
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