If all the code is your own, consider the approach we used in dssi-vst, which is to use the GPL plus an exception to allow for the unavailability of VSTSDK sources. It won't be GPL-compatible or "Debian" free, but nothing will be if not all the source is available, and I think it best expresses the intention -- if your preference would naturally be for the GPL, that is. Meanwhile, write and remind Steinberg that their license could be more helpful to developers of Windows and Linux plugins and hosts. It won't be news and there's no real reason they should care, but it's worth a nudge that these things matter to people, including those who would like to promote, recommend and use their standard. As it happens I'm also shortly about to release a Windows plugin host that is not at all in competition with Steinberg products, but that can't host VSTs for licensing reasons and will use DSSI plugins instead. Hosting audio plugins is not a major part of this program so the difference isn't going to be all that significant to me or anyone else, but it's an interesting situation. Chris