<blockquote>
<p>I'm not sure if "contributors" is enough for legal requirements. I'm not a lawyer, still I assume using an undefined bunch of people (i.e. "contributors") properly is not valid for copyright assignment.</p>
</blockquote>
<p>Well, "contributors" as recorded in the VCS record is what I meant.  That is definitely recorded for contributions since git, and in the prior SVN commit comments where committers were fairly diligent in acknowledging contributors.</p>
<blockquote>
<p>are you referring just to the About dialog or any copyright notice in the whole source code?</p>
</blockquote>
<p>Oh, I didn't think of that, I was only thinking about things that are visible like the dialogs.</p>
<p>IANAL as you know, but I was alerted to it by problems that another project had when someone re-used their (substantial) contribution under another license and the project objected.  The contributor pointed out they owned the material and could license it any way they wanted and if the project continued to object they would sue it for claiming copyright of material it didn't own because it had a notice very similar to Geanys.  The project is now offline, although I can't say if it is because of that issue.</p>

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