<b>- Building Ardour, Qtractor, LMMS with VST-support is illegal, right?<br><br></b>No. <i>Distributing</i> these packages (that were built with the official VST SDK) is illegal.<br><b><br>- And energyxt? Are they allowed to use VST technology?</b><br>
<br>Yes.<br><b><br>- Installing JOST and using it, is illegal right?</b><br><br>No.<br><br><i>No</i> to the rest of the questions too.<br><br>As a user, you have all the rights to build and use a program with VST support. You must not distribute it, <i>a la</i> "share".<br>
<br>The SDK is "freely available", but the license forbids "redistribution". What this means is that everyone is a developer in that sense; you download the SDK, build the program, and then use it, end of story/signal flow.<br>
<br>There are "wrappers" that work around this, basically an application written from scratch to use Wine and emulate VST handles. An example is LMMS - you can distribute it and still enjoy VST support. The best route IMHO.<br>