FOSS licenses come in two approaches. The distinction is _who_ is granted the most freedom: - in "copyleft" licenses the emphasis is on the end-user, ensuring that they are _always_ passed the four freedoms; - in "permissive" licenses, the emphasis is on other developers/programmers, including allowing them to _not_ pass on the four freedoms. Is disappointing people still mistake this as being a difference between #FreeSoftware and #OpenSource because each has always supported both types.