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They can relicense Oracle-owned code under GPL. As just one example. There are probably other options, too.

• p_l 7y ago
  Yes, and it would require starting the port from zero, as I have said.
  • hvis 7y ago
    Nah, it's the same code. There would be no need to create a new derivative work. It's a pipe dream anyway, of course.
    • p_l 7y ago
      It's not the same code - OpenZFS has substantially diverged from ZFS v28 which was last common version between OpenZFS and Solaris, that's one thing. Another is that all the porting work in ZoL that isn't already GPLv2 is CDDL - and Oracle is not the copyright owner. In fact, the copyright owners would not want to change the license to GPLv2, unless maybe it was done as dual license.