Yes and they have a poor implementation for encryption at that. Pawel who did the port of zfs to FreeBSD did not like how they implemented it. As far as zfs goes oracle will be the odd man out compatibility wise with the rest of the platforms supporting zfs and the openzfs encryption scheme.
Oracle ZFS does have encryption, but this implementation fixes a few security / usability issues with it, adds more features, and brings the implementation into the open source world.