How does WSPR fit FCC Rules?

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How does WSPR fit FCC Rules?

The recent WSPR story in Nuts & Volts suggested an interesting activity and reminded me that I've been intending to get licensed.

As I have looked at license manuals, I can't find a spot in the FCC rules that permits WSPR. Part 97.111(b) defines a list of permitted, short, one way transmissions. WSPR does not appear to fit the list because it is a list of "short" transmissions.

Part 97.203 addresses beacons and permitted beacon frequencies. According to this paragraph, no beacons are permitted below 28.2 MHz.

What an I missing and what loophole allows WSPR transmissions 24 hours per day?