<div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">2016-11-06 0:25 GMT+01:00 Simon Poole <span dir="ltr"><<a href="mailto:simon@poole.ch" target="_blank">simon@poole.ch</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><p>Historically using CC by-SA for the tiles had a certain logic, as
the data used that licence and while there was a cloud of
uncertainty how that would apply to OSM data, you could reasonably
argue that the tiles were a derivative and had to be licensed on
the same terms.</p>
<p> Post licence change that tight linkage has gone and the creator
of a "Produced Work" has a large degree of freedom in how to
license their work. It would, for example, be completely possible
to take the CC0 licensed openstreetmap-carto style sheet and
produce -exactly- the same tiles as the standard layer and license
them differently. </p></blockquote><div><br><br></div><div>I'm not sure it is like this. Just because the code to produce the work has a CC0 license attached to it does not necessarily mean that the resulting cartography is also free of rights. At least the copyright page at <a href="http://www.openstreetmap.org/copyright">http://www.openstreetmap.org/copyright</a> clearly has a different claim on it (if deliberately or as result of oversight is not clear to me).<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><p>Or are we claiming that we are actually
licensing the design/look and feel of the standard tiles on CC
by-SA terms (and by that have rights in any derivatives of that
style) and you can't actually use openstreetmap-carto style sheet
to produce a style that is visually similar to our standard style?</p></blockquote><div><br><br></div><div>that's what we seem to do right now, yes.<br><br></div><div>Admittedly there is quite some probability that the current claim of cc-by-sa 2.0 cartography is not because the creators of this work had been requiring it (AFAIK originally Steve Chilton and his team, now Andy and all the other contributors to the style), as they have expressed consent / will to release the style in CC0.<br><br></div><div>What we actually might want to achieve with the cc-by-sa on the tiles is that people who use tiles produced and distributed with our ressources will have to credit OSM for this and should not be able to restrict the further downstream distribution.<br><br></div><div>Cheers,<br></div><div>Martin<br></div></div></div></div>