Re: why is graphviz package non-free?
* Brian Thomas Sniffen:
>> Software under the BSD license is free. Software that is sometimes under
>> one and sometimes under another ought to still be free.
> It is. But software under a "you get GPL-like rights to my parts of
> this thing we're building together, and I get BSD-like rights to your
> parts" license is not free.
For quite a few GPL software projects, this is the only way to get
changes into upstream. Does this make the software non-free? I don't
think so, even though the process is just legally effective variant of
the asymmetric license.