Well, a year ago or so I tried to open a support request to get the specs. Of course they didn't give away anything and closed the support request (later I found that they even deleted it).
I really don't get that secrecy since no internals are required to be disclosed, just the USB specs to be able to send and receive commands. And if someone really wants to (e.g. competitors), the binary driver will be reverse-engineered.
In fact, the only way a Linux driver is possible (and it was, for older POD hardware, thanks to Markus Grabner and Stefan Hajnoczi) is reverse engineering the USB protocol using a Windows computer.
Sad :(
