CC-BY=>CC-BY-SA/GFDL

A couple of simple questions:

Can CC-BY material be incorporated into CC-BY-SA material?
Can CC-BY material be incorporated into GFDL material?

We have such compatibility from BSD or PD into GPL, and it's
pretty
important in that context -- but it's not clear to me if the
same
principle is applicable for these scenarios. CC-BY seems to
require
that no new restrictions can be applied beyond the original
licensing,
and that would seem to make the licenses incompatible. Is
that
interpretation correct? If so, can this problem be solved?
It seems
that at least unidirectional compatibility would be
desirable.


-- 
Peace & Love,
Erik

DISCLAIMER: This message does not represent an official
position of
the Wikimedia Foundation or its Board of Trustees.

"An old, rigid civilization is reluctantly dying.
Something new, open,
free and exciting is waking up." -- Ming the Mechanic
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Erik Moeller wrote:
> A couple of simple questions:
> 
> Can CC-BY material be incorporated into CC-BY-SA
material?

Yes.

> Can CC-BY material be incorporated into GFDL material?

Yes.

> We have such compatibility from BSD or PD into GPL, and
it's pretty
> important in that context -- but it's not clear to me
if the same
> principle is applicable for these scenarios. CC-BY
seems to require
> that no new restrictions can be applied beyond the
original licensing,
> and that would seem to make the licenses incompatible.
Is that
> interpretation correct? If so, can this problem be
solved? It seems
> that at least unidirectional compatibility would be
desirable.

The no-new-restrictions rule refers to restrictions placed
by the
licensee on the work supplied by the original licensor. 
Anyone who
comes across the CC-BY-SA material or the GFDL material is
free to use
the original CC-BY work under the original CC-BY terms.  The
licensee is
free to license her contributions to the combined work on
whatever terms
she likes, including CC-BY-SA and GFDL.

James
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