I wish to create an app for studying Japanese Kanji. However I’m uncertain which license would best fit it. I want my app to be Opensource so that I can use the code for tutorials and other people may benefit from the example. I want to release the app for free so that I can improve the Japanese learning community, however I don’t want that a person/company rips all my source code, polishes it a bit and sells it for money. When I look at the available popular Opensource licenses they all allow “Commercial Use” (http://choosealicense.com/licenses/). I don’t mind people using my source code for practice or their own apps, as long as they also published it for free and Opensource. So what would be appropriate licenses?