Are you sure it isn't for a book/course/mentorship or something else that compliments CC
Opensource is open to the public, meaning you can get the source code for free.
I know many people who sell open source software, but they aren't selling the software. They usually selling an additive (education/service/ etc).
Wordpress is opensource. But you can buy themes, which are opensource except for the design which is copyrighted. So the sale of the themes is usually for 1 year support.