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<p>See mainly this (1 year+ old) thread:
<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/pipermail/legal-talk/2015-May/008127.html">https://lists.openstreetmap.org/pipermail/legal-talk/2015-May/008127.html</a></p>
<p>Essentially the issue is with 4b and 4c of CC by 4.0: any
inclusion of a third party CC by 4.0 licensed database in a
database in which the rights holder claims Sui Generis rights (for
example the OSMF in OpenStreetMap data) creates Adapted Material,
which per 4c requires licensing on the terms of 3a of which 3.a.4.
would seem to make it impossible to license the end result on ODbL
terms (since it applies to the combined database).</p>
<p>Simon<br>
</p>
<br>
<div class="moz-cite-prefix">Am 08.07.2016 um 21:22 schrieb Diane
Peters:<br>
</div>
<blockquote
cite="mid:CAJjMn5o3ErDOPXG7RdcP=bPdkNDjQ93+jMuihxz1s3cZWjRk-w@mail.gmail.com"
type="cite">
<div dir="ltr">Do you mind expanding on what you mean when you say
CC hasn't addressed the viral nature of BY 4.0 relative to
databases? Trying to understand.</div>
<div class="gmail_extra"><br clear="all">
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<div class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">Diane M. Peters
<div>General Counsel, Creative Commons
<div>Portland, Oregon<br>
<div><a moz-do-not-send="true"
href="http://creativecommons.org/staff#dianepeters"
target="_blank">http://creativecommons.org/staff#dianepeters</a></div>
<div><span style="color:rgb(0,0,0)">13:00-21:00
UTC</span><br>
<br>
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<div class="gmail_quote">On Fri, Jul 8, 2016 at 9:41 AM, Simon
Poole <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:simon@poole.ch" target="_blank">simon@poole.ch</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><span
class=""><br>
><br>
> There are no substantial differences between the CC
BY 3.0 and the CC BY<br>
> 4.0 licences. A summary of the differences can be
found here:<br>
> <a moz-do-not-send="true"
href="https://creativecommons.org/share-your-work/licensing-considerations/version4/"
rel="noreferrer" target="_blank">https://creativecommons.org/share-your-work/licensing-considerations/version4/</a>.<br>
> CC BY 4.0 (like CC BY 3.0) does not prevent
OpenStreetMap from applying<br>
> your own licence to your products but requires end
users to comply with<br>
> the CC BY licence (in relation to the original data).<br>
><br>
</span>Just a further remark, this comparaison does not
address the potential<br>
viral character of CC by 4.0 when database rights are
involved (which<br>
unluckily CC seems to be completly quiet on), which again
would cause<br>
issues when including such data in OSM.<br>
<span class="HOEnZb"><font color="#888888"><br>
Simon<br>
<br>
</font></span><br>
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