Question about the Vovida licence

[jerome.marant@free.fr (Jérôme Marant)]

When looking at the opensource.org page, I discovered that the Vovida
Licence (http://www.vovida.org/licence.html) is considered as
OSD compliant.

However, the fourth clause tells that
"4. Products derived from this software may not be called "VOCAL", nor
    may "VOCAL" appear in their name, without prior written
    permission."

Is this compatible with the third clause of the DFSG ? It looks like a
restriction on the distribution.

BTW, it looks like a "DJB-like" clause but DJB software are not OSD compliant. 

Thanks.

-- 
Jérôme Marant <jerome.marant@free.fr>

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