"Giacomo A. Catenazzi" <c...@debian.org> wrote in message
news:49c8da6f.7050...@debian.org...
4. You do not have to provide a copy of the FLTK license
with programs that are linked to the FLTK library, nor
do you have to identify the FLTK license in your
program or documentation as required by section 6
of the LGPL.
However, programs must still identify their use of FLTK.
The following example statement can be included in user
documentation to satisfy this requirement:
[program/widget] is based in part on the work of
the FLTK project (http://www.fltk.org).
The December version has the above statement. The inclusion of such a
statement appears to be a limitation on the the permission to omit the LGPL
licence text. Even if that is not a limitation on this new permission, in
this wording, the existing requirements of the LGPL to preserve copyright
notices appears equivlent.
Indeed all of the december licence appears to be additional permissions. It
would be preferable if it were clear if this is really just the GPL+special
exceptions, such that derivitives could remove the special exceptions. If it
is not intended to be such, the FSF would probably take issue with this
license
So, my thought are that the December version is free, being just
LGPL+additional permissions. I also tend to think it is fully GPL
compatible, although I would really prefer clarification on it being just
standard removable special exceptions.
Unfortunately the same is not true of the May version:
4. Authors that develop applications and widgets that
use FLTK must include the following statement in
their user documentation:
[program/widget] is based in part on the work of
the FLTK project (http://www.fltk.org).
That requirement is free, but makes this GPL-incompatible. This also appears
to be an abuse of the LGPL, which should never have additional restrictions
attached to it.
Reccomendation: Check with upstream to see if the December version applies
to libfltk2. If so, that is good. If not, try to convince them to update it
to use the new license or preferably, an even newer version of the license
that uses the standard special exception terms.
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