Forking a dual licensed app: How to license on my end?

Posted by TheLQ on Programmers See other posts from Programmers or by TheLQ
Published on 2011-02-27T06:40:16Z Indexed on 2011/11/13 10:08 UTC
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I forked a project that was dual licensed under the GPL and a commercial license. Since my code was open source and the GPL being what it is, I started by releasing my app under the GPL.

But now I'm thinking about dual licensing the project and can't figure out what to do. Since I have copyright on a majority of the code (most of the code was either rewritten or new), can I just pick a commercial license or do I have to buy the upstream commercial license since I'm technically a "derivative" of the project?

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