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<p>Thanks for the link to the ticket. One minor correction:</p>
<p>
<blockquote type="cite">PROJ support the Well-Known Text and
Well-Known Text2 described in the ISO 19111 standard
on "Referencing by coordinates". I am not aware of any official
certification. To the
best of my knownledge PROJ is the first application to implement
WKT2, so it can in some
sense be regarded as a reference implementation.
</blockquote>
To my knowledge, the first open-source project to support ISO
19162 (a.k.a. WKT2) was an ESRI prototype [1] and the second
project was Apache SIS [2] since 2017. PROJ is third. PROJ is
however the first project to my knowledge to implement the WKT2
update published in 2019, but this is a relatively minor revision
of ISO 19162:2015 (compared to WKT 1).<br>
</p>
<p>On EPSG, can we really said that the data fail under MIT license
because we do not modify it? The EPSG terms of use said:</p>
<p>
<blockquote type="cite">You are obliged to inform anyone to whom
you provide the EPSG Facilities of these Terms of Use.</blockquote>
So we need to inform users that they can not modify those data
without changing the EPSG name. And also that they can not extract
the data and sell them alone (without the added value of PROJ or
other software). Those conditions are not MIT terms.<br>
</p>
<p>The Apache Software Foundation legal team has debated about the
permission to include EPSG data in Apache software [3], and our
conclusion was that we can not provide them directly. We do that
indirectly by providing the data in a "non-free" package and
require an explicit action from users (which we try to make as
simple as possible) to get them.<br>
</p>
<p>Regards,</p>
<p> Martin<br>
</p>
<pre>[1] <a class="moz-txt-link-freetext" href="https://github.com/Esri/ogc-crs-wkt-parser">https://github.com/Esri/ogc-crs-wkt-parser</a>
[2] <a class="moz-txt-link-freetext" href="http://sis.apache.org/">http://sis.apache.org/</a>
[3] <a class="moz-txt-link-freetext" href="https://issues.apache.org/jira/browse/LEGAL-183">https://issues.apache.org/jira/browse/LEGAL-183</a>
</pre>
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