Oracle could make the whole problem with the CDDL, ZFS, an Linux not-invented-here syndrome, to say nothing of copyright estoppel, go away by releasing an updated version of the CDDL that is compatible with the GPLv2.
Oracle could make the whole problem with the CDDL, ZFS, an Linux not-invented-here syndrome, to say nothing of copyright estoppel, go away by releasing an updated version of the CDDL that is compatible with the GPLv2.