Re: Fw: gnuplot, is it free?

["Jordi Gutierrez Hermoso" <jordigh@gmail.com>]

On 21/12/06, Carles Pina i Estany <carles@pina.cat> wrote:
> It is not possible to distribute new versions of gnuplot (only original
> source code and patches), etc.

According to the 4th DFSG:

   Integrity of The Author's Source Code

   The license may restrict source-code from being distributed in
   modified form _only_ if the license allows the distribution of
   "patch files" with the source code for the purpose of modifying
   the program at build time. The license must explicitly permit
   distribution of software built from modified source code. The
   license may require derived works to carry a different name or
   version number from the original software. (This is a
   compromise. The Debian group encourages all authors not to
   restrict any files, source or binary, from being modified.)

so patch files are ok. The IceWeasel fork is another example of this
("... derived works to carry a different name...").

- Jordi G. H.