I&#x27;m going to go with the actual author of the licence (Danese), and not just because she authored it but because the idea that Sun management, seeing themselves struggle against Linux, would allow Linux to use their prized ZFS and DTrace, and thus offer even less reason to choose Solaris over Linux is simply insane from any kind of business point.<p>And not even now do we have anyone arguing here that CDDL is not GPL-incompatible, people accept that and Linus refuses to merge any CDDL code in to mainline, what is being discussed here is if ZFS counts as a derivative (and thus has to be GPL compatible) when it runs as a kernel module in Linux kernel space.