Those who wish to learn more about copyleft after reading Ben's article may also want to look at the copyleft guide https://copyleft.org/guide https://copyleft.

Those who wish to learn more about copyleft after reading Ben's article may also want to look at the copyleft guide https://copyleft.org/guide https://copyleft.org/guide for more information. Ben is a contributor to the copyleft guide, so we'll likely merge in his article into the Guide.