The readme says the license is: > Permafrost Engine is licensed under the GPLv3, with a special linking exception. Does anyone know what the "special linking

The readme says the license is: > Permafrost Engine is licensed under the GPLv3, with a special linking exception. Does anyone know what the "special linking exception" is? I've heard of a linking exception before with GPL essentially making it LGPL. But I wonder how this "special" exception is related.