All sketches shared on OpenProcessing are licensed under Creative Commons Attribution-Share Alike 3.0.
All source code provided is licensed under
Creative Commons GNU General Public License.
There are many classes and workshops around the world that teach Processing, and OpenProcessing.org is a host to many of these, by allowing professors and students to collaborate on the web, and share with the world how they study Processing.
See the list of classes that use OpenProcessing.