you can not sublicense, mix with non-free code neither by libs nor corba
If copyright does consider this a single combined work,
then the GPL itself has this consequence.
If copyright law does not consider "combining with CORBA" to make a
single combined work, then a copyright-based license cannot
validly contain this criterion.
Either way, there is no need to add this condition.
you have to include the note `This distro is partially made of free
software'
in all ads of distros mixed from either free and non-free code
Since the required sentence does not contain the author's name, this
does not cause the same practical problems as the BSD advertising clause.
However, it shares with the BSD advertising clause the characteristic
of being probably unenforcible under US law (though it may be
enforcible in some countries).
Also, it would be incompatible with the GPL.
