Re: why is graphviz package non-free?

[Brian Thomas Sniffen <bts@alum.mit.edu>]

Matthew Garrett <mgarrett@chiark.greenend.org.uk> writes:

>>> Why not? Which freedoms does it impact upon?
>> 
>> The freedom to make and distribute modifications without paying the
>> author.  Becoming part of a commons is not a payment.
>
> By that definition, all licenses that imposes any restrictions on the
> license of your modifications requires a payment.

All of the licenses in Debian that impose a restriction on the license
of modifications either:

* only impose entry into a commons.

OR

* are the QPL.

I think any license that imposes restrictions on the license of
distributed modifications -- other than entry into a commons, that is,
the same terms under which you received the work -- is non-Free.

-Brian

-- 
Brian Sniffen                                       bts@alum.mit.edu