[OSM-talk-be] Fietsnet using OSM

[Kurt Roeckx]

On Mon, Aug 22, 2011 at 11:29:34AM +0200, Gerard Vanderveken wrote:
> Hi,
> 
> In fact, you can do anything you want  with the data itself, as long
> as there is an attribution for OpenStreetmap in, and its CC-BY-SA
> license applies to the outcoming results.
> (It works in a manner 'contagious' like the GPL for programs does.
> You may use and change every program, but the result (with your
> additions) is also GPL.)
> So, the OSM data makes the resulting  map tiles, geodata, routes,
> GPX data, etc also Copyright by OSM and licensed with the CC-BY-SA
> licence

Note that if you make a derived product, the copyright isn't all
by OSM, you will basicly have multiple persons having copyright
claims.

But the new contribution terms for OSM itself require us to basicly
transfer the copyright of our contributions to the OSM foundation.
This wasn't the case before the new contribution terms and basicly
everybody kept it's own copyright.

But it's true that the license require that a derived product should
still comply with the same license as you got, be it the CC-BY-SA or
the ODBL.

> See http://www.openstreetmap.org/copyright and  the legal FAQ on
> http://wiki.openstreetmap.org/wiki/Legal_FAQ and some
> interpretations at
> http://wiki.openstreetmap.org/wiki/Common_licence_interpretations
> In principle you can not combine licenses. Because they are all not
> compatible, even if they are also some kind of 'open', except for
> Public Domain, were you can do what you want.

Licenses can be compatible, there are alot of cases of it.  If
they couldn't be compatible we wouldn't have much open source
software that's legal.  But there are also alot of problems with
open licenses that aren't compatible.

However, combining proprietary licenses with open licenses almost
always gives problems.

> For maps this is not a problem, because it can be build with several
> transparant layers, each with their copyright and license.

As long as you can keep the data in layers, this is probably true.
The question is always if it's a derived product or not, and if it
is derived from OSM, it must comply with OSM's license.


Kurt