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How does a Java package published on Maven documents the provenance (origin and license) of an open source project packaged and published in such a public repo?

In particular what can I do to document and how should I document my code when I am the author and publisher of a package?

And what if this is a package (possibly modified) that I have not authored but that I only publish as Maven Central Jar?

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If I understand your question correctly, you can simple add this information to your POM file. The following is an example from the Maven POM reference. 

<licenses>
  <license>
    <name>Apache License, Version 2.0</name>
    <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
    <distribution>repo</distribution>
    <comments>A business-friendly OSS license</comments>
  </license>
</licenses>

<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                      https://maven.apache.org/xsd/maven-4.0.0.xsd">
  ...
  <organization>
    <name>Codehaus Mojo</name>
    <url>http://mojo.codehaus.org</url>
  </organization>
</project>

As for your last question, I'm not entirely sure what you're asking, but I would say point the URL to your fork.

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  • Thanks. You mean point the url to your fork? which url? the license URL? – Philippe Ombredanne Feb 9 '17 at 14:50
  • The project URL @PhilippeOmbredanne – RubberDuck Feb 9 '17 at 15:20
  • If I can put more than one license <tags>, would this mean that all the licenses apply or that this is a choice of licenses? – Philippe Ombredanne Feb 9 '17 at 22:46
  • I assume that would mean you're dual licensing @PhilippeOmbredanne, but that is just an assumption. – RubberDuck Feb 9 '17 at 22:47

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