Clarify licenses

[yarikoptic]

ATM we seems have no mentioning of copyright/license terms for materials in this repository.

also it would be nice to use .svg feature to have license specified within "Document properties", e.g. here is an exemplar diff if it was CC-BY-4.0

@@ -53,8 +54,22 @@
         <dc:format>image/svg+xml</dc:format>
         <dc:type
            rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
-        <dc:title></dc:title>
+        <cc:license
+           rdf:resource="http://creativecommons.org/licenses/by/4.0/" />
       </cc:Work>
+      <cc:License
+         rdf:about="http://creativecommons.org/licenses/by/4.0/">
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Reproduction" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#Distribution" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Notice" />
+        <cc:requires
+           rdf:resource="http://creativecommons.org/ns#Attribution" />
+        <cc:permits
+           rdf:resource="http://creativecommons.org/ns#DerivativeWorks" />
+      </cc:License>
     </rdf:RDF>
   </metadata>
   <g

[jsheunis]

Other information might be usable here once this is resolved: datalad/datalad.org#107

[adswa]

Is there anything in this repo that isn't suitable for CC-BY? Everything I contributed can certainly be shared under CC-BY. Even if we can't say that for every item in this repo, we can at least declare a license for everything we're sure about

[jsheunis]

Same for anything I contributed, whether it's in this repo or elsewhere.

[aqw]

I released all of my contributions as CC-BY-SA 4.0 (see original copyright.html page).

I do like the SA, but if there's a desire to avoid that, I would be willing to re-license my stuff in order to keep everything consistent.

[adswa]

I do like the SA, but if there's a desire to avoid that, I would be willing to re-license my stuff in order to keep everything consistent.

From my POV its totally fine to keep it CC-BY-SA

[adswa]

I'm starting to curate a list and will open a PR that others can extend.

[adswa]

It got auto-closed with #13, but not all is done, so I'm reopening it that we don't forget.