Re:Apple relases open source modules of Big Sur
by ghaff on Thursday January 07, 2021 @04:05PM
(#25677463)
Probably (I haven't studied it) because of what the FSF says here "It is not a true copyleft, because it allows linking with other files which may be entirely proprietary." So it's apparently file-based copyleft, which is in the same vein as CDDL. (Which is also generally considered GPL-incompatible for that reason.)
1: https://www.gnu.org/philosophy/apsl.en.html