Haukur Þorgeirsson wrote:
That's exactly as I feared then - GFDL isn't a
very
suitable license to make free images with. And someone
who wanted to make a postcard series out of the
featured pictures would indeed have problems since
many of them are only licensed under the GFDL.
This is a problem and we need to address it.
It is being addressed at the level of the license itself in a
forthcoming update to the license.
--Jimbo