Although disappointed, I completely respect the limitations of the agreement that you made. You have no choice but to abide by it, and not discuss the SDK.
I consider this an unfortunate policy of Smarthome. They should be doing everything possible to popularize their protocols. This is a hot area for both software and hardware developers alike. There is much to be gained from a policy of openness. The present one stifles innovation and probably delays the popularization of Insteon.
As I'm serious about this, I will look into making the purchase of the SDK and protyping module. I can only guess at how many people have not purchased Insteon equipment for their house as the cost of entry into development is too steep for the majority of hobbyists.
Regards,
Stuart
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