Passage: Any contributor could create and own new Knol articles, and there could be multiple articles on the same topic with each written by a different author.Authors could also choose to include ads from Google's AdSense on their pages. This profit-sharing was criticized as incentivizing self-promotion or spam.All contributors to the Knol project had to sign in with a Google account and were supposed to state their real names. Contributions were licensed by default under the Creative Commons CC-BY-3.0 license (which allowed anyone to reuse the material as long as the original author was named), but authors were also able to choose the CC-BY-NC-3.0 license (which prohibits commercial reuse) or traditional copyright protection instead. Knol employed "nofollow" outgoing links, using an HTML directive to prevent links in its articles from influencing search-engine rankings.

Question: What does the CC-BY-NC 3.0 license do?
prohibits commercial reuse