<p></p>
<blockquote>
<p>I guess I would have to get permission from anybody who made changes to lineoperations under the old license.</p>
</blockquote>
<p>That is what other projects that have changed licenses did yeah, my glance at git said not many people, and hopefully they will reply yes to a request for permission.</p>
<blockquote>
<p>Would changing this license to GPLv3 cause problems in the future?</p>
</blockquote>
<p>Doubt it, there is at least one plugin with GPL3 license already (commander) and Geany itself is GPL2+ which is compatible.</p>

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