To clarify that a bit: The CDDL is a per-file copyleft; you must provide the sources of the CDDL-licensed source files. The GPL is a per-program copyleft; you

To clarify that a bit: The CDDL is a per-file copyleft; you must provide the sources of the CDDL-licensed source files. The GPL is a per-program copyleft; you must provide the sources of the entire program if it contains GPL-licensed code; the source of the entire program effectively becomes GPL-licensed if you incorporate GPL-licensed code. If I made a closed derivative of the FreeBSD kernel, I'd have to provide the (CDDL) ZFS sources, but nothing else. If ZFS were GPL, I'd have to provide the sources to the entire kernel.