Re: [DotGNU]UDDI (was Re: Our blindspot)

[Richard Stallman]

    When one speaks of GPL "compatible", I believe this often is meant as 
    something else; software that can be used with or linked with software 
    under the GPL but which is itself under a different and non-conflicting 
    license.  Clearly anything that is "convertable" to the GPL is in effect 
    compatible as well, although the reverse need not be true.

The reverse does need to be true.  The reason is, validly combining
the two programs produces a combination you must release under the
GPL.  Thus, making the combination effectively means converting any
parts that have GPL-compatible licenses.