>[T]he class covered the Outer Space Treaty, a creation of the United Nations that governs outer-space actions and (in some people's interpretations) makes the legality of space mining dubious.
If this topic interests you, there's a whole category at your local library for Space Law (it's at the end, KZD1002-6715): https://www.loc.gov/aba/cataloging/classification/lcco/lcco_...