inspect "copyleft" variants for licenses

[client9]

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

[client9]

Sadly some people add copyleft and a copying file.