Ok, thanks for clarifying that, you're right I was thinking that free = copyleft. This came from thinking that open source = non-copyleft + copyleft, and that i

Ok, thanks for clarifying that, you're right I was thinking that free = copyleft. This came from thinking that open source = non-copyleft + copyleft, and that it doesn't care at all about copyleft, while FS does, so FS = OS - non-copyleft = copyleft.