Sam Varghese wrote an article
analysing
John Sullivan's study on the use of the GNU General Public Licence (GPL) in the
Debian project.
John, executive director at the Free Software Foundation, said during his
FOSDEM 2012 talk titled "Is copyleft being framed?" that
93% of Debian "Squeeze"'s packages are released under licences in
the GPL family (including the GPL, the Affero GPL and LGPL), showing a
constant and significant increase from the previous releases.
The numbers in the talk were calculated using an existing Debian tool, but Russ Allbery
mentioned that it
wasn't
designed to be used this way, so the current figures are only preliminary.