Porting ZFS to Linux is complicated by the fact that the GNU General Public License, which governs the Linux kernel, is incompatible with the Sun CDDL under which ZFS is distributed. According to some developers[who?] a single derived work of both projects cannot be legally distributed, as it is not possible to simultaneously meet both licenses' requirements. To include ZFS in the Linux kernel it would have to be cleanly reimplemented, and patents may hamper this.
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Tyrael