dfsg-free global digital elevation model (GDEM)?
I am looking for a DFSG-free  global digital elevation model (GDEM)
which I ultimately want to package for debian.
is the SRTM  data DFSG-free?
is the ASTER  data DFSG-free?
is there a void-filled/combined DFSG-free dataset?
Looks like the cgiar  dataset is unfortunately non-free .
Maybe TanDEM-X  will provide a DFSG-free dataset in the near future?
Thanks for any comments,