xPLLib License Issue...

[Mal Lansell <mal@xxxxxxxxxxx>]

I'm currently working on a ZWave connector for xPL.  I have some ZWave
devices, and they work really well - because they are RF there are none
of the delays of X10, and they confirm their status changes (hooray!).

Unfortunately, there is no free SDK for controlling ZWave via their PC
interfaces.  IMO, this is a huge mistake, but that's how it is.  Zensys'
own ZWave SDK is very expensive, but there is a company called
ControlThink that is in the process of creating a USB interface, and
that will ship with a usable SDK.  This SDK will also work with other
ZWave controllers, and licenses will be available to download and use
the SDK without needing to buy their hardware.

The SDK is written in .NET, so I would like to use the .NET xPLLib to
handle the xPL side of things, and here is where I run into the
problem.  xPLLib is released under the GPL license, and as far as I can
tell, that is incompatible with the ZWave SDK license (which requires
the purchase of the SDK and therefore prevents me releasing the
connector software as freeware).

Is there a way round this?  Have I misunderstood the GPL license?  Or am
I going to have to not use the xPLLib - which would seriously impede my
ability to release this useful connector service?

Regards

Mal