It's the other way around. It's the GPL which is incompatible with the CDDL (and many other licences). The CDDL is actually very permissive. You can combine

It's the other way around. It's the GPL which is incompatible with the CDDL (and many other licences). The CDDL is actually very permissive. You can combine it with anything, including proprietary licences.