`Copyleft*` is often used for licenses (maybe not so much golang.. but..) https://www.google.com/search?client=safari&rls=en&q=site:github.com+copyleft&ie=UTF-8&oe=UTF-8#q=site:github.com+copyleft.md https://www.google.com/search?client=safari&rls=en&q=site:github.com+copyleft&ie=UTF-8&oe=UTF-8#q=site:github.com+copyleft.txt
