https://www.gnu.org/philosophy/free-sw.html https://www.gnu.org/philosophy/free-sw.html http://www.gnu.org/licenses/license-list.html http://www.gnu.org/licens

https://www.gnu.org/philosophy/free-sw.html https://www.gnu.org/philosophy/free-sw.html http://www.gnu.org/licenses/license-list.html http://www.gnu.org/licenses/license-list.html clang is "free software" according to his own definition. It is entirely possible for a specific free software program to be a setback to the goals of the free software movement. His position is that copyleft licenses (very often, and certainly in this specific case) advance the goal of freedom more effectively than non-copyleft licenses. The differing values in this case basically amounts to whether one considers it worth using a copyleft license to ensure that the software being used remains free, or whether one considers it a drawback that a copyleft license may prevent it being used in proprietary software.