How is the CDDL more restrictive than the GPL ? As far as I can tell, ZFS can be included because the CDDL imposes less restrictions on the final distribution (

How is the CDDL more restrictive than the GPL ? As far as I can tell, ZFS can be included because the CDDL imposes less restrictions on the final distribution (the non-CDDL parts don't have to abide by the CDDL license, which would be the case with the GPL).