&gt; &gt; his opinion should carry a lot of weight<p>&gt; That&#x27;s nice, but it&#x27;s only one side. What about the opinion of the developers who wrote the module and licensed it under CDDL?<p>The developers&#x27; opinions don&#x27;t matter. All contributors used to have to sign a CLA to give copyright to Sun. Then Sun was bought by Oracle. So you should care about what Oracle thinks about copyright infringement.<p>&gt; The incompatibility between CDDL and GPL is well-known, and the authors at Sun made it that way deliberately.<p>No, that&#x27;s bullshit. CDDL (which is just the MPL) is a file-based copyleft because <i>that&#x27;s what license fitted their requirements</i>. It&#x27;s not their fault that people have a completely fucked up interpretation of &quot;derivative work&quot; that includes any combination of two completely separately developed works.