When you post your creative works online. Creative Commons offers an assortment of licenses to select; some prohibit commercial use, and some don’t. Some people read those licenses; some don’t.
“Fight Over Flickr’s Use of Photos,” Wall Street Journal, November 25, 2014 B3. Flickr, owned by Yahoo, is selling pictures that others posted online with a license that permits commercial use, as long as the original creator is credited; Flickr doesn’t share the profits. Some say this is unfair.
If you license your work, know what the license says and, more importantly, what it means.