In fact, that's the reason why CDDL is not GPL compatible. Because
GPL is not compatible with other open-source licenses if the other
licenses grant too many permissions to the recipient.
Specifically:
GPL prohibits the recipient from static linking with a closed-source
product, or using closed-source build scripts. CDDL does not make
that restriction. CDDL permits the recipient to build the CDDL code
into a proprietary product, and only the original CDDL code and
modifications to it must be open source and available under CDDL.
All the other stuff that gets linked, and the build process itself,
are permitted to be closed source. This is too permissive to be
compatible with GPL.
These reasons don't make CDDL incompatible with GPL. GPL is
compatible with any license which is at least as permissive as itself.
GPLv2 only requires that the recipient be able to receive all of the
source code under terms which allow building new binaries (including
based on modified source code) and distributed under similar terms.
There might be some other reason that CDDL could be considered
incompatible with GPL, but not the reasons you mentioned.
I think that the reason that Linux does not want to pick up zfs is
more a matter of control and philosophy than actual license
incompatibility.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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