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From Rebecca Boyle's article in Popular Science:
Some space colonization advocates argue that guaranteeing ownership of celestial real estate is a necessary precursor to developing that real estate. Just last month, the Competitive Enterprise Institute, a libertarian think tank, proposed that the U.S. recognize off-planet property rights [3] to spur space development.
Links:
[1] http://cei.org/adjunct-scholar/rand-simberg
[2] http://www.popsci.com/technology/article/2012-04/technological-challenges-aside-asteroid-mining-legal
[3] http://www.popsci.com/technology/article/2012-04/free-market-advocates-planet-property-rights-will-spur-space-frontier-development